AlphaShooters.com

News & Community for Sony Alpha Shooters

You are here: Home / Sony Alpha Mirrorless Cameras / Sony A1 Guides & Resources / Best Sony A1 Memory Cards With Speed & Buffer Tests

Disclosure: As an Amazon Associate I earn from qualifying purchases made through links on this site. I may also earn from links to other online retailers at no extra cost to you.

by - 20 Comments

The Sony a1 or Alpha 1 as it is also known, is Sony’s flagship camera with a stacked 50MP sensor capable of shooting up to 30 FPS and 8k video.

To keep up with the larger files and faster frame rate, the Sony a1 supports the much faster CFexpress Type-A memory cards in both slots.

Fortunately UHS-I and UHS-II SD cards are also supported because CFexpress Type A cards are not cheap, but then neither is the a1.

Sony A1 Memory Card Guide

In this article I’ve speed tested four CFexpress Type-A cards so far, along with 10 UHS-II cards in-camera to discover which are the best memory cards, since in-camera write speeds don’t always match what’s on the card label.

Please be warned, there is a lot of data crunching in this article as I wanted to test all of the different file formats and drive modes of the a1, apart from Lo (5 fps) because no one should be buying the a1 to shoot at this speed! Also my sanity couldn’t take any more tests.

Table of Contents[Hide][Show]

Quick In-Camera Card Speed Comparison

Here’s a quick in-camera card speed comparison for all of the CFexpress Type-A and UHS-II SD cards that I’ve tested. You’ll find my complete buffer test results a little further down.

CFexpress Type-A Memory Cards

These tests were done using the Sony a1 and 160GB cards.

Memory CardIn-Camera Write SpeedPrice Check
1. Delkin Devices BLACK CFexpress Type-A617 MB/sB&H Photo | Amazon
2. Delkin Devices POWER CFexpress Type-A617 MB/sB&H Photo | Amazon
3. Sony CEA-G CFexpress Type-A600 MB/sB&H Photo | Amazon
4. ProGrade Digital CFexpress Type-A Cobalt600 MB/sB&H Photo | Amazon
In-camera write speeds are when shooting uncompressed raw.

UHS-II SD Memory Cards

These tests were done using the Sony a1 and 64GB cards.

Memory CardIn-Camera Write SpeedPrice Check
1. Kingston Canvas React Plus260 MB/sB&H Photo | Amazon
2. Sony SF-G Tough260 MB/sB&H Photo | Amazon
3. ProGrade V90257 MB/sB&H Photo | Amazon
4. SanDisk Extreme Pro247 MB/sB&H Photo | Amazon
5. Delkin Devices POWER246 MB/sB&H Photo | Amazon
6. Angelbird AV Pro Mk 2 V90246 MB/sB&H Photo | Amazon
7. Sony SF-M Tough 150 MB/sB&H Photo | Amazon
8. Sony SF-M150 MB/sB&H Photo | Amazon
9. Lexar Professional 2000X141 MB/sB&H Photo | Amazon
10. Transcend SD 700S140 MB/sB&H Photo | Amazon

Sony A1 Price Check at: B&H Photo

If you find this article helpful you may also find my Sony A1 Accessories Guide and Lenses Guide helpful.

Sony A1 Forum & Facebook Group

If you are looking for further help and advice on the a1 or would simply like to share your photos and videos, then please head over to our new Sony A1 Forum. If you prefer Facebook then I also run the Sony A1 Shooters Group.

Which Memory Cards are Supported?

The Sony a1 supports CFexpress Type A memory cards in both slots. UHS-I and UHS-II (SDHC/SDXC) SD cards are also supported in both card slots, but not at the same time as the CFexpress cards.

Sony a1 Memory Cards

CFexpress Type-A Memory Card Buffer Tests

Although CFexpress is an open standard only Sony, ProGrade and more recently Delkin Devices are producing this type of card right now.

Sadly this means that the price is sky high.

If you shoot a lot of continuous bursts and demand the fastest buffer clearing times then these are the cards that you will probably want to be using in your Sony a1.

1. Delkin Devices BLACK CFexpress Type A

Delkin Devices BLACK CFexpress Type A (880/790)

The Delkin Devices BLACK CFexpress Type-A memory cards are designed and supported in the USA.

These BLACK cards also include a 48 Hour Replacement Guarantee.

They are available in both 80GB and 160GB capacities. Both capacities have the same read speeds but the larger 160GB card has a slightly faster write speed.

  • Max Read Speed: 880MB/s
  • Max Write Speed: 730MB/s (80GB)
  • Max Write Speed: 790MB/s (160GB)

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 617 MB/s.

Here are my in-camera speed test results using a 160GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps8911.05
Compressed RAW (54.2MB) – 30 fps1559.61
Lossless Compressed RAW (59.5MB) – 20 fps1066.51
JPEG Extra Fine (26MB) – 30 fps1287.46
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps7614.46
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps11915.00
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps759.61
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1595.95
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps1516.83
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)8911.05
Compressed RAW (54.2MB)26511.35
Lossless Compressed RAW (59.5MB)1066.51
JPEG Extra Fine (26MB)1797.43
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)7614.46
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)14415.83
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)759.61
HEIF (4:2:0) Extra Fine (15.7 MB)2845.88
HEIF (4:2:2) Extra Fine (18 MB)2676.75
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)10311.35
Compressed RAW (54.2MB)44111.70
Lossless Compressed RAW (59.5MB)1746.73
JPEG Extra Fine (26MB)3727.25
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)8314.23
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)17915.18
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)9910.11
HEIF (4:2:0) Extra Fine (15.7 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (18 MB)Never hits buffer< 2.00

Price Check & Buyer Reviews for Delkin Devices BLACK CFexpress Type A

At: Amazon | B&H Photo

2. Delkin Devices POWER CFexpress Type A

Delkin Devices POWER CFexpress Type A (880/790)

The Delkin Devices POWER CFexpress Type-A memory cards are designed and supported in the USA.

They are available in both 80GB and 160GB capacities, both capacities have the same read speeds but the larger 160GB card has a slightly faster write speed.

  • Max Read Speed: 880MB/s
  • Max Write Speed: 730MB/s (80GB)
  • Max Write Speed: 790MB/s (160GB)

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 617 MB/s.

Here are my in-camera speed test results using a 160GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps8911.04
Compressed RAW (54.2MB) – 30 fps1559.63
Lossless Compressed RAW (59.5MB) – 20 fps1066.52
JPEG Extra Fine (26MB) – 30 fps1287.45
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps7614.48
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps11915.02
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps759.65
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1595.96
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps1516.82
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)8911.04
Compressed RAW (54.2MB)26511.37
Lossless Compressed RAW (59.5MB)1066.52
JPEG Extra Fine (26MB)1797.43
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)7614.48
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)14415.83
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)759.65
HEIF (4:2:0) Extra Fine (15.7 MB)2845.89
HEIF (4:2:2) Extra Fine (18 MB)2676.75
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)10311.34
Compressed RAW (54.2MB)44111.71
Lossless Compressed RAW (59.5MB)1746.76
JPEG Extra Fine (26MB)3727.28
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)8314.22
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)17915.21
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)9910.12
HEIF (4:2:0) Extra Fine (15.7 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (18 MB)Never hits buffer< 2.00

Price Check & Buyer Reviews for Delkin Devices POWER CFexpress Type A

At: Amazon | B&H Photo

3. Sony CEA-G CFexpress Type-A

Sony CFexpress Type A Memory Cards

Sony CEA-G Series CFexpress Type-A memory cards can write up to 700MB/s and read up to 800MB/s according to Sony and they are available in 80GB and 160GB capacities.

This Tough version has been rigidity tested to 150 newtons to protect your card data during drops from up to 7.5 meters, they are also IP57 rated for dust and moisture protection.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed of this card is around 600 MB/s.

Here are my in-camera speed test results using a 160GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps8711.45
Compressed RAW (54.2MB) – 30 fps1529.80
Lossless Compressed RAW (59.5MB) – 20 fps1056.11
JPEG Extra Fine (26MB) – 30 fps1337.05
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps7514.26
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps12515.10
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps859.75
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1615.61
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps1615.61
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)8711.45
Compressed RAW (54.2MB)26511.45
Lossless Compressed RAW (59.5MB)1056.11
JPEG Extra Fine (26MB)2106.93
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)75 14.26
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)14614.96
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)859.75
HEIF (4:2:0) Extra Fine (15.7 MB)2996.25
HEIF (4:2:2) Extra Fine (18 MB)2996.25
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)10211.45
Compressed RAW (54.2MB)44911.45
Lossless Compressed RAW (59.5MB)1836.18
JPEG Extra Fine (26MB)4746.70
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)8414.16
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)17815.15
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)1009.63
HEIF (4:2:0) Extra Fine (15.7 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (18 MB)Never hits buffer < 2.00

Price Check & Buyer Reviews for Sony CEA-G CFexpress Type-A

At: Amazon | B&H Photo

4. ProGrade Digital CFexpress Type A Cobalt

ProGrade Digital 160GB CFexpress Type A Cobalt Memory Card

The ProGrade Digital CFexpress Type A Cobalt Memory Card can write up 700MB/s and read up to 800MB/s, so their label speeds are identical to the Sony cards. They are only available in 160GB capacity.

Although not as tough as the Sony cards, they do feature a metal enclosure/encasement that has been designed to endure high temperatures and provide better thermal conductivity.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 600 MB/s.

Here are my in-camera speed test results using a 160GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting the BufferTime to Clear Buffer (seconds)
Uncompressed RAW (108.3MB) – 20 fps8711.46
Compressed RAW (54.2MB) – 30 fps1529.90
Lossless Compressed RAW (59.5MB) – 20 fps1056.11
JPEG Extra Fine (26MB) – 30 fps1277.85
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps7514.73
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps11715.03
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps729.50
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1616.23
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps1616.23
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)8711.46
Compressed RAW (54.2MB)26511.51
Lossless Compressed RAW (59.5MB)1056.11
JPEG Extra Fine (26MB)2106.95
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)7514.27
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)14614.92
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)859.75
HEIF (4:2:0) Extra Fine (15.7 MB)2996.25
HEIF (4:2:2) Extra Fine (18 MB)2996.25
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)10211.46
Compressed RAW (54.2MB)44911.46
Lossless Compressed RAW (59.5MB)1836.18
JPEG Extra Fine (26MB)4746.70
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)8414.17
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)17815.15
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)1009.63
HEIF (4:2:0) Extra Fine (15.7 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (18 MB)Never hits buffer< 2.00

Price Check & Buyer Reviews for ProGrade Digital CFexpress Type A Cobalt

At: Amazon | B&H Photo

UHS-II Memory Card Buffer Tests

The Sony a1 also supports UHS-I and UHS-II memory cards. Here are my top 10 recommendations based on my in-camera speed/buffer tests:

1. Kingston Canvas React Plus UHS-II SDXC Memory Card (300/260)

Kingston Canvas React Plus UHS-II SDXC Memory Cards

Kingston have been in the memory business since 1987, so it’s safe to say they know a thing or two about memory!

Their Canvas React Plus UHS-II SDXC cards have a claimed read speed of 300MB/s and a write speed of 290MB/s. In-camera they write at the same speed (260MBs) as the Sony SF-G Tough cards but they are typically priced around 40% less for a 64GB card and also currently include a UHS-II card reader.

They receive very positive reviews and appear to be just as reliable as the Sony and SanDisk cards. They are V90 rated and available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 260 MB/s. Here are my in-camera speed test results using a 64GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps7325.83
Compressed RAW (54.2MB) – 30 fps15026.55
Lossless Compressed RAW (59.5MB) – 20 fps8214.26
JPEG Extra Fine (26MB) – 30 fps15412.19
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps6931.96
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps11332.66
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps7021.13
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1645.41
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps1645.41
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7325.83
Compressed RAW (54.2MB)16627.80
Lossless Compressed RAW (59.5MB)8214.26
JPEG Extra Fine (26MB)16016.23
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6931.96
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11835.72
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)7021.13
HEIF (4:2:0) Extra Fine (15.7 MB)3055.86
HEIF (4:2:2) Extra Fine (18 MB)3136.93
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7826.36
Compressed RAW (54.2MB)18528.17
Lossless Compressed RAW (59.5MB)8615.80
JPEG Extra Fine (26MB)19615.86
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)7033.96
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)12536.81
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)7323.80
HEIF (4:2:0) Extra Fine (15.7 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (18 MB)14058.76

These cards are only marginally faster than the Sony SF-G Tough memory cards but in the US and the UK they are around 40 percent cheaper. Unless you need the tougher construction of the Sony Tough cards then these are the UHS-II cards that I would recommend for the a1.

Price Check & Buyer Reviews for Kingston Canvas React Plus UHS-II SDXC

At: Amazon | B&H Photo

2. Sony SF-G Tough UHS-II (300/299)

sony a7iii sf-g tough UHS-II memory cards

The Sony SF-G Tough cards have a claimed read speed of 300MB/s and a write speed of 299MB/s. They are V90 rated and available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.

The Sony Tough series of memory cards are 18 times stronger than traditional SD cards, bend proof to 180N, drop-proof to 5 meters, waterproof to a depth of 5 meters for up to 72 hours (IPX8 rating) and dust proof with an IP6X rating.

Tough cards feature a one-piece ribless structure and don’t have the common lock switch, they are also X-ray proof, magnet proof, anti-static and temperature proof.

Very Important Note: Old versions of these cards do not work with the a1. I get a message that says: “Unable to use Memory Card. Slot 1″. Sony has a replacement program for older versions of these cards due to VSC mode (Video Speed Class) issues where recorded footage on the card may be damaged or may not be recorded optimally. You can find out if your cards are affected by checking this article.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 260 MB/s. Here are my in-camera speed test results using a 64GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps7325.20
Compressed RAW (54.2MB) – 30 fps15027.30
Lossless Compressed RAW (59.5MB) – 20 fps8115.33
JPEG Extra Fine (26MB) – 30 fps12914.02
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps6933.40
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps11228.84
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps7418.76
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1585.80
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps1596.26
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7325.20
Compressed RAW (54.2MB)16627.43
Lossless Compressed RAW (59.5MB)8115.33
JPEG Extra Fine (26MB)16215.13
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6933.40
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)12128.91
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)7418.76
HEIF (4:2:0) Extra Fine (15.7 MB)2765.93
HEIF (4:2:2) Extra Fine (18 MB)3146.38
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7626.16
Compressed RAW (54.2MB)18327.55
Lossless Compressed RAW (59.5MB)8915.43
JPEG Extra Fine (26MB)20115.76
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)7229.71
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)13328.91
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)7818.61
HEIF (4:2:0) Extra Fine (15.7 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (18 MB)Never hits buffer< 2.00

Price Check & Buyer Reviews for Sony SF-G Tough UHS-II

At: Amazon | B&H Photo

3. ProGrade V90 UHS-II (300/250)

ProGrade V90 UHS-II Memor Cards

The ProGrade V90 cards have a claimed read speed of 300MB/s and a write speed of 250MB/s. They are V90 rated and available in 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 257 MB/s. Here are my in-camera speed test results using a 64GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps7226.63
Compressed RAW (54.2MB) – 30 fps14927.66
Lossless Compressed RAW (59.5MB) – 20 fps8015.37
JPEG Extra Fine (26MB) – 30 fps14113.83
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps6834.06
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps11035.45
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps7022.73
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1605.55
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps1595.70
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7226.63
Compressed RAW (54.2MB)16427.60
Lossless Compressed RAW (59.5MB)8015.37
JPEG Extra Fine (26MB)17313.81
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6834.06
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11735.21
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)7022.73
HEIF (4:2:0) Extra Fine (15.7 MB)3015.50
HEIF (4:2:2) Extra Fine (18 MB)2995.58
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7726.88
Compressed RAW (54.2MB)18327.63
Lossless Compressed RAW (59.5MB)8815.40
JPEG Extra Fine (26MB)23213.96
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)7033.75
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)12535.51
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)7522.90
HEIF (4:2:0) Extra Fine (15.7 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (18 MB)Never hits buffer< 2.00

Price Check & Buyer Reviews for ProGrade V90 UHS-II

At: Amazon | B&H Photo

4. SanDisk Extreme Pro UHS-II (300/260)

SanDisk Extreme Pro UHS-II V90 Memory Cards

The SanDisk Extreme Pro cards have a claimed read speed of 300MB/s and a write speed of 260MB/s. They are V90 rated and available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 247 MB/s. Here are my in-camera speed test results using a 64GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps7025.50
Compressed RAW (54.2MB) – 30 fps14527.91
Lossless Compressed RAW (59.5MB) – 20 fps8115.57
JPEG Extra Fine (26MB) – 30 fps13714.28
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps6634.36
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps11036.26
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps7023.62
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1545.81
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps1606.48
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7025.50
Compressed RAW (54.2MB)16427.90
Lossless Compressed RAW (59.5MB)8115.57
JPEG Extra Fine (26MB)17114.71
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6634.36
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11636.88
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)7023.62
HEIF (4:2:0) Extra Fine (15.7 MB)3375.66
HEIF (4:2:2) Extra Fine (18 MB)3546.78
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7725.76
Compressed RAW (54.2MB)18227.81
Lossless Compressed RAW (59.5MB)8715.50
JPEG Extra Fine (26MB)21214.63
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)7134.85
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)12436.28
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)7023.83
HEIF (4:2:0) Extra Fine (15.7 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (18 MB)Never hits buffer< 2.00

Very Important Note: Older versions of this card are not V90 rated and therefore will not work in certain video modes. See the video section of this guide for details on which video file formats require V90 rated cards.

Price Check & Buyer Reviews for SanDisk Extreme Pro UHS-II

At: Amazon | B&H Photo

5. Delkin Devices 64GB POWER UHS-II SDXC (300/250)

Delkin Devices 64GB POWER UHS-II SDXC

The Delkin Devices 64GB POWER UHS-II SDXC memory cards support read speeds of up to 300 MB/s and write speeds of 250 MB/s. They are also V90 rated for video. They are available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 246 MB/s. Here are my in-camera speed test results using a 64GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps7127.56
Compressed RAW (54.2MB) – 30 fps15029.43
Lossless Compressed RAW (59.5MB) – 20 fps7617.53
JPEG Extra Fine (26MB) – 30 fps12417.08
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps6737.08
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps11041.18
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps6626.07
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1637.20
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps1448.86
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7127.56
Compressed RAW (54.2MB)16329.33
Lossless Compressed RAW (59.5MB)7617.53
JPEG Extra Fine (26MB)15318.26
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6737.08
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11641.18
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)6626.07
HEIF (4:2:0) Extra Fine (15.7 MB)2747.61
HEIF (4:2:2) Extra Fine (18 MB)2228.64
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7627.99
Compressed RAW (54.2MB)18029.95
Lossless Compressed RAW (59.5MB)8616.81
JPEG Extra Fine (26MB)17918.35
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)7037.52
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)12241.03
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)7327.06
HEIF (4:2:0) Extra Fine (15.7 MB)8277.83
HEIF (4:2:2) Extra Fine (18 MB)4738.48

Price Check & Buyer Reviews for Delkin Devices POWER UHS-II SDXC

At: Amazon | B&H Photo

6. Angelbird AV Pro Mk 2 V90 (300/280)

Angelbird AV Pro Mk 2 Memory Cards

The Angelbird AV Pro Mk 2 V90 UHS-II memory cards support read speeds of up to 300 MB/s and write speeds of 280 MB/s. They are also V90 rated so they guarantee a minimum write speed of 90 MB/s. They are available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 246 MB/s. Here are my in-camera speed test results using a 64GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps7027.11
Compressed RAW (54.2MB) – 30 fps14828.46
Lossless Compressed RAW (59.5MB) – 20 fps7916.08
JPEG Extra Fine (26MB) – 30 fps13015.13
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps6735.36
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps11038.20
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps7319.41
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1635.51
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps1595.60
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7027.11
Compressed RAW (54.2MB)16328.46
Lossless Compressed RAW (59.5MB)7916.08
JPEG Extra Fine (26MB)16515.23
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6735.36
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11637.70
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)7319.41
HEIF (4:2:0) Extra Fine (15.7 MB)2895.78
HEIF (4:2:2) Extra Fine (18 MB)1895.58
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7626.98
Compressed RAW (54.2MB)18128.34
Lossless Compressed RAW (59.5MB)8615.95
JPEG Extra Fine (26MB)19915.36
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6934.91
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)12237.67
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)7919.53
HEIF (4:2:0) Extra Fine (15.7 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (18 MB)Never hits buffer< 2.00

Price Check & Buyer Reviews for Angelbird AV Pro Mk 2 Memory Cards

At: Amazon | B&H Photo

7. Sony SF-M Tough UHS-II (277/150)

Sony SF-M Tough UHS-II Memory Cards

Sony’s SF-M Tough Series are similar to the more expensive SF-G version but these are only rated V60 for video and their read time has been cut to 277MB/s and the write time to 150MB/s. They are available in 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.

Very Important Note: Old versions of these cards do not work with the a1. I get a message that says: “Unable to use Memory Card. Slot 1″. Sony has a replacement program for older versions of these cards due to VSC mode (Video Speed Class) issues where recorded footage on the card may be damaged or may not be recorded optimally. You can find out if your cards are affected by checking this article.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 150 MB/s. Here are my in-camera speed test results using a 64GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps7046.87
Compressed RAW (54.2MB) – 30 fps14048.48
Lossless Compressed RAW (59.5MB) – 20 fps7327.16
JPEG Extra Fine (26MB) – 30 fps12626.52
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps6660.23
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps10863.85
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps6741.20
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1419.80
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps13411.37
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7046.87
Compressed RAW (54.2MB)14748.10
Lossless Compressed RAW (59.5MB)7327.16
JPEG Extra Fine (26MB)13726.73
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6660.23
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11163.34
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)6741.20
HEIF (4:2:0) Extra Fine (15.7 MB)18910.03
HEIF (4:2:2) Extra Fine (18 MB)11511.06
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7246.77
Compressed RAW (54.2MB)15547.67
Lossless Compressed RAW (59.5MB)7727.10
JPEG Extra Fine (26MB)15026.65
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6759.35
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11462.77
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)6940.96
HEIF (4:2:0) Extra Fine (15.7 MB)29110.13
HEIF (4:2:2) Extra Fine (18 MB)22811.25

Price Check & Buyer Reviews for Sony SF-M Tough UHS-II

At: Amazon | B&H Photo

8. Sony SF-M UHS-II (277/150)

Sony SF-M UHS-II Memory Cards

Sony’s SF-M Series are identical to the SF-M Tough Series just without the added toughness so they cost a little less. The Sony SF-M cards have a claimed read speed of 277MB/s and a write speed of 150MB/s. They are V60 rated and available in 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.

Very Important Note: Old versions of these cards do not work with the a1. I get a message that says: “Unable to use Memory Card. Slot 1″. Sony has a replacement program for older versions of these cards due to VSC mode (Video Speed Class) issues where recorded footage on the card may be damaged or may not be recorded optimally. You can find out if your cards are affected by checking this article.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 150 MB/s. Here are my in-camera speed test results using a 64GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps7046.87
Compressed RAW (54.2MB) – 30 fps14048.48
Lossless Compressed RAW (59.5MB) – 20 fps7327.16
JPEG Extra Fine (26MB) – 30 fps12626.52
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps6660.23
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps10863.85
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps6741.20
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps1419.80
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps13411.37
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7046.87
Compressed RAW (54.2MB)14748.10
Lossless Compressed RAW (59.5MB)7327.16
JPEG Extra Fine (26MB)13726.73
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6660.23
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11163.34
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)6741.20
HEIF (4:2:0) Extra Fine (15.7 MB)18910.03
HEIF (4:2:2) Extra Fine (18 MB)11511.06
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7246.77
Compressed RAW (54.2MB)15547.67
Lossless Compressed RAW (59.5MB)7727.10
JPEG Extra Fine (26MB)15026.65
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6759.35
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11462.77
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)6940.96
HEIF (4:2:0) Extra Fine (15.7 MB)29110.13
HEIF (4:2:2) Extra Fine (18 MB)22811.25

Price Check & Buyer Reviews for Sony SF-M UHS-II

At: Amazon | B&H Photo

9. Lexar Professional 2000X UHS-II (300/260)

Lexar Professional 2000X UHS-II

The Lexar Professional 2000X cards have a claimed read speed of 300MB/s and a write speed of 260MB/s. They are V90 rated and available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) sizes.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 141 MB/s. Here are my in-camera speed test results using a 64GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps7050.49
Compressed RAW (54.2MB) – 30 fps13754.57
Lossless Compressed RAW (59.5MB) – 20 fps6930.51
JPEG Extra Fine (26MB) – 30 fps12133.15
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps6667.68
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps10773.60
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps6649.90
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps12014.97
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps12015.63
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7050.49
Compressed RAW (54.2MB)14254.00
Lossless Compressed RAW (59.5MB)6930.51
JPEG Extra Fine (26MB)13133.48
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6667.68
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11073.70
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)6649.90
HEIF (4:2:0) Extra Fine (15.7 MB)14813.41
HEIF (4:2:2) Extra Fine (18 MB)13915.50
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7151.25
Compressed RAW (54.2MB)15253.34
Lossless Compressed RAW (59.5MB)7630.71
JPEG Extra Fine (26MB)14033.28
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6668.17
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11173.70
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)6748.97
HEIF (4:2:0) Extra Fine (15.7 MB)18513.63
HEIF (4:2:2) Extra Fine (18 MB)16615.50

Based on these results it looks like the Lexar Professional 2000X is underperforming in the a1 for some reason, as they should be capable of writing faster than the results we see here.

Price Check & Buyer Reviews for Lexar Professional 2000X

At: Amazon | B&H Photo

10. Transcend SD 700S UHS-II (285/180)

Transcend SD 700S SD Cards

The Transcend SD 700S cards have a claimed read speed of 285MB/s and a write speed of 180MB/s. They are V90 rated and available in 32GB (SDHC), 64GB (SDXC) sizes.

In-Camera Speed & Buffer Test Results

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 140 MB/s. Here are my in-camera speed test results using a 64GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB) – 20 fps6949.58
Compressed RAW (54.2MB) – 30 fps13953.25
Lossless Compressed RAW (59.5MB) – 20 fps7228.61
JPEG Extra Fine (26MB) – 30 fps12924.23
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps6660.78
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps10765.47
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps9941.45
HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps13310.95
HEIF (4:2:2) Extra Fine (18 MB) – 30 fps13311.30
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)6949.58
Compressed RAW (54.2MB)14553.22
Lossless Compressed RAW (59.5MB)7228.61
JPEG Extra Fine (26MB)14124.21
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6660.78
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11163.63
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)9941.45
HEIF (4:2:0) Extra Fine (15.7 MB)19210.85
HEIF (4:2:2) Extra Fine (18 MB)17210.88
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (108.3MB)7149.67
Compressed RAW (54.2MB)15353.50
Lossless Compressed RAW (59.5MB)7727.36
JPEG Extra Fine (26MB)15724.11
Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB)6661.37
Compressed RAW (54.2MB) + JPEG Extra Fine (26MB)11564.32
Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB)6941.51
HEIF (4:2:0) Extra Fine (15.7 MB)3129.61
HEIF (4:2:2) Extra Fine (18 MB)24411.06

Price Check & Buyer Reviews for Transcend SD 700S UHS-II

At: Amazon | B&H Photo

APS-C Mode Buffer Tests

If you shoot in APS-C mode (21MP) then you might be interested in how many shots you can take before hitting the buffer and the clearing time.

For my own sanity I’ve only tested two cards: the Sony CEA-G CFexpress Type-A Card and the Sony SF-G Tough UHS-II Card.

Sony CEA-G CFexpress Type-A Card

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 600 MB/s. Here are my in-camera speed test results using a 160GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (44.4MB) – 20 fps3238.06
Compressed RAW (23.1MB) – 30 fps3518.70
Lossless Compressed RAW (26.4MB) – 20 fps4655.58
JPEG Extra Fine (11.1MB) – 30 fps4448.66
Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB) – 20 fps2049.90
Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB) – 30 fps34611.70
Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB) – 20 fps3817.31
HEIF (4:2:0) Extra Fine (4.2 MB) – 30 fps4448.51
HEIF (4:2:2) Extra Fine (4.9 MB) – 30 fps4268.68
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (44.4MB)3238.06
Compressed RAW (23.1MB)Never hits buffer< 2.00
Lossless Compressed RAW (26.4MB)4655.58
JPEG Extra Fine (11.1MB)Never hits buffer< 2.00
Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB)2049.90
Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB)82711.88
Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB)3817.31
HEIF (4:2:0) Extra Fine (4.2 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (4.9 MB)Never hits buffer< 2.00
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (44.4MB)10908.66
Compressed RAW (23.1MB)Never hits buffer< 2.00
Lossless Compressed RAW (26.4MB)Never hits buffer< 2.00
JPEG Extra Fine (11.1MB)Never hits buffer< 2.00
Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB)3499.70
Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB)Never hits buffer< 2.00
Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB)Never hits buffer< 2.00
HEIF (4:2:0) Extra Fine (4.2 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (4.9 MB)Never hits buffer< 2.00

Price Check & Buyer Reviews for Sony CEA-G CFexpress Type-A

At: Amazon | B&H Photo

Sony SF-G Tough UHS-II

When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 260 MB/s. Here are my in-camera speed test results using a 64GB card:

Drive Mode Hi+ (Max 30fps)

Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.

Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (44.4MB) – 20 fps14917.75
Compressed RAW (23.1MB) – 30 fps33018.18
Lossless Compressed RAW (26.4MB) – 20 fps21110.55
JPEG Extra Fine (11.1MB) – 30 fps4218.91
Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB) – 20 fps13322.10
Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB) – 30 fps24324.55
Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB) – 20 fps15315.35
HEIF (4:2:0) Extra Fine (4.2 MB) – 30 fps4278.75
HEIF (4:2:2) Extra Fine (4.9 MB) – 30 fps6278.80
Drive Mode Hi (Max 20fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (44.4MB)14917.75
Compressed RAW (23.1MB)50418.45
Lossless Compressed RAW (26.4MB)21110.55
JPEG Extra Fine (11.1MB)Never hits buffer< 2.00
Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB)13322.10
Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB)28824.56
Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB)15315.35
HEIF (4:2:0) Extra Fine (4.2 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (4.9 MB)Never hits buffer< 2.00
Drive Mode Mid (Max 15fps)
Image TypeShots Before Hitting BufferTime to Clear Buffer (Seconds)
Uncompressed RAW (44.4MB)17717.68
Compressed RAW (23.1MB)91819.41
Lossless Compressed RAW (26.4MB)32511.00
JPEG Extra Fine (11.1MB)Never hits buffer< 2.00
Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB)14722.06
Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB)36324.61
Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB)18515.28
HEIF (4:2:0) Extra Fine (4.2 MB)Never hits buffer< 2.00
HEIF (4:2:2) Extra Fine (4.9 MB)Never hits buffer< 2.00

Price Check & Buyer Reviews for Sony SF-G Tough UHS-II

At: Amazon | B&H Photo

Memory Card Readers

If you want to read any of the above cards to your computer then you are also going to need a compatible memory card reader for the card that you are using. Here are a few options:

Sony MRW-G2 CFExpress Type-A Card Reader

Sony MRW-G2 CFexpress Type A/SD Memory Card Reader

The Sony MRW-G2 supports both CFexpress Type A cards as well as a SD/SDHC/SDXC cards, along with transfer speeds of up to 10 Gb/s via USB 3.1 Gen 2. Both USB Type-C to Type-C and USB Type-C to Type-A cables are included.

Price Check & Buyer Reviews for Sony MRW-G2

At: Amazon | B&H Photo

ProGrade Digital CFexpress Type A & UHS-II SDXC Dual-Slot USB 3.2 Gen 2 Card Reader

ProGrade Digital CFexpress Type A & UHS-II SDXC Dual-Slot USB 3.2 Gen 2 Card Reader

The ProGrade Digital reader is a little cheaper than the Sony MRW-G2 but has basically the same specs. It has one CFexpress Type A slot and one UHS-II SDXC slot, and also support up to 10 Gb/s via USB 3.2 Gen 2 to deliver transfer speeds of up to 1.25 GB/s, or 1250 MB/s via its USB Type-C interface. It includes USB Type-C to Type-C and Type-C to Type-A cables.

Price Check & Buyer Reviews for ProGrade Digital CFexpress Type A & UHS-II SDXC Reader

At: Amazon | B&H Photo

Sony MRW-S1 UHS-II USB Memory Card Reader/Writer

sony mrw-s1 uhs-ii reader for a7iii

If you don’t plan on using CFexpress Type A cards then you can save a lot of money by purchasing Sony’s MRW-S1 UHS-II USB SD Card Reader/Writer instead. It can read/write to UHS-II SD Cards via a USB 3.1 interface and is backward compatible with UHS-I SD cards. The MRW-S1 together with Sony SF-G cards can transfer files to and from your computer around 2.6x faster than UHS-I SD cards.

Price Check & Buyer Reviews for Sony MRW-S1

At: Amazon | B&H Photo

Memory Cards for Recording Video

The Sony a1 supports both 4k and 8k video recording. However, even when shooting in XAVC HS 8K 400Mbps you’ll only need a v60 rated SD card or faster. For XAVC S-I 4K you will need a V90 rated card or faster.

Sony a1 movie recording formats and compatible memory cards are shown in the table below.

File FormatMaximum Recordable Bit RateSupported Memory Card
XAVC HS 8K400MbpsCFexpress Type A memory card (VPG200 or higher)
SDXC V60 or higher
XAVC HS 4K280MbpsCFexpress Type A memory card (VPG200 or higher)
SDXC V60 or higher
XAVC S 4K280MbpsCFexpress Type A memory card (VPG200 or higher)
SDXC V60 or higher
XAVC S HD100MbpsCFexpress Type A memory card
SDHC/SDXC card (U3 or higher)
XAVC S-I 4K600MbpsCFexpress Type A memory card (VPG200 or higher)
SDXC V90 or higher
XAVC S-I HD222MbpsCFexpress Type A memory card (VPG200 or higher)
SDXC V90 or higher

Memory Cards for S&Q Motion Shooting

For most S&Q settings you will be able to use a V60 or V90 rated memory card. You will only need to use a CFexpress Type A card (VPG 200 or higher) when recording in XAVC S-I 4K format and 1200Mbps, or XAVC S-I HD and 890Mbps with 240fps/200fps.

Slow-motion and quick-motion movie shooting are not available with [XAVC HS 8K].

Sony a1 S&Q formats and compatible memory cards are shown in the table below.

File FormatMaximum Recordable Bit RateSupported Memory Card
XAVC HS 4K500MbpsCFexpress Type A memory card (VPG200 or higher)
SDXC V60 or higher*1
XAVC S 4K560MbpsCFexpress Type A memory card (VPG200 or higher)
SDXC V60 or higher*1
XAVC S HD500MbpsCFexpress Type A memory card (VPG200 or higher)
SDXC V60 or higher*2
XAVC S-I 4K1200MbpsCFexpress Type A memory card (VPG200 or higher)
SDXC V90 or higher*3
XAVC S-I HD890MbpsCFexpress Type A memory card (VPG200 or higher)
SDXC V90 or higher*4

*1When [S&Q Frame Rate] is set to [120fps]/[100fps], you may need an SDXC V90 memory card.

*2When [S&Q Frame Rate] is set to [240fps]/[200fps], you may need an SDXC V90 memory card.

*3For slow-motion recording, a CFexpress Type A memory card (VPG200 or higher) is required.

*4When [S&Q Frame Rate] is set to [240fps]/[200fps], a CFexpress Type A memory card (VPG200 or higher) is required.

What Size Memory Card Do You Need?

If you will be shooting a lot of continuous bursts then you will probably want to use at least a 128GB UHS-II card. For CFexpress you can only choose between 80GB and 160GB right now, and they are very expensive.

If you are not shooting long continuous bursts then you’ll probably be fine with 32GB or 64GB cards, and you certainly won’t need the faster CFexpress Type A cards.

For shooting video the size of memory card will depend largely on the format that you are recording in. Or you may be using an external recorder anyway so this won’t be so important.

The following tables will help you to better understand what size cards you need.

How Many Images Can Be Recorded on a Memory Card?

The table below shows the approximate number of images that can be recorded on a memory card formatted in-camera when using a Sony memory card with the aspect ratio set to 3:2 and JPEG/HEIF size set to L:50M.

The values may vary depending on the shooting conditions and the type of memory card used.

File Format64GB SD128GB SD80GB CF160GB CF
JPEG Light680013600790015600
JPEG Standard47009400540010800
JPEG Fine3200640037007400
JPEG Extra fine1700340019004000
HEIF Light9100182001060021200
HEIF Standard680013600790015600
HEIF Fine510010200590011800
HEIF Extra fine3400690040008000
RAW & JPEG (Compressed RAW)70014008001700
RAW & HEIF (Compressed RAW)80016009001800
RAW (Compressed RAW)900190011002200
RAW & JPEG (Lossless Compressed)60013007001500
RAW & HEIF (Lossless Compressed)70014008001600
RAW (Lossless Compressed)80016009001900
RAW & JPEG (Uncompressed RAW)4008005001000
RAW & HEIF (Uncompressed RAW)4009005001000
RAW (Uncompressed RAW)50010006001200

Movie Record Times

The table below shows the approximate total recording times using a Sony memory card formatted in the Sony a1. The values may vary depending on the shooting conditions and the type of memory card used.

File FormatRec Frame RateRecord Setting64GB SD128GB SD80GB CF160GB CF
XAVC HS 8K30p/25p400M15 min35 min20 min40 min
XAVC HS 8K30p/25p200M35 min70 min40 min1 h 25 min
XAVC HS 4K60p/50p200M35 min70 min40 min1 h 25 min
XAVC HS 4K60p/50p150M45 min1 h 35 min55 min1 h 50 min
XAVC HS 4K60p/50p100M1 h 10 min2 h 20 min1 h 20 min2 h 50 min
XAVC HS 4K60p/50p75M1 h 30 min3 h1 h 40 min3 h 40 min
XAVC HS 4K60p/50p45M2 h 20 min4 h 50 min2 h 40 min5 h 40 min
XAVC S 4K60p/50p200M35 min1 h 10 min40 min1 h 25 min
XAVC S 4K60p/50p150M45 min1 h 35 min55 min1 h 50 min
XAVC S HD60p/50p50M2 h 10 min4 h 30 min2 h 30 min5 h 10 min
XAVC S HD60p/50p25M3 h 50 min8 h 10 min6 h 30 min9 h 10 min
XAVC S-I 4K60p/50p600M/500M10 min25 min10 min25 min
XAVC S-I HD60p/50p222M/185M30 min1 h 5 min35 min1 h 15 min

Simultaneous Recording Slot 1 + Slot 2

If you shoot simultaneously to both memory card slots then I recommend using either two CFexpress cards or two UHS-II cards. If you use a CFexpress card in slot 1 and a UHS-II card in slot 2 then the write speed will be limited by the slower UHS-II card.

Summary

If you shoot a lot of continuous bursts and want the fastest buffer clearing times then you’ll want to go with a CFexpress Type-A card.

If you shoot compressed RAW you’ll hit the buffer after around 152 shots which will clear the buffer in around 10 seconds with a CFexpress card.

If you use a fast UHS-II card like the Kingston Canvas React Plus then you’ll shoot around 150 shots and clear the buffer in around 26 seconds.

The Delkin CFexpress cards are marginally faster than both Sony and Prograde cards when shooting uncompressed RAW.

The Sony CFexpress cards are slightly faster than both the Delkin and Prograde cards when shooting jpegs.

But there’s really so little difference in terms of performance between the 4 CFexpress Type-A cards currently available that it’s not worth basing your buying decision on this alone.

Personally I’d go with whichever cards are cheaper at the time of purchase, which is often the Prograde cards.

If you shoot simultaneously to both memory card slots then I recommend using either two CFexpress cards or two UHS-II cards. If you use a CFexpress card in slot 1 and a UHS-II card in slot 2 then you will be limited by the slower UHS-II card.

For video shooters you’ll only need to use a CFexpress card when shooting in S&Q mode and recording in XAVC S-I 4K format and 1200Mbps, or XAVC S-I HD and 890Mbps with 240fps/200fps. For all other modes a V90 UHS-II card will be sufficient.

FAQs

Which memory cards are supported in the Sony a1?

The Sony a1 supports CFexpress Type A memory cards in both slots. UHS-I and UHS-II SD cards are also supported in both card slots.

Why are CFexpress Type A cards so expensive?

Because currently Sony is the only company making them, there is no competition so they can charge what they like, and they are doing exactly this. Hopefully this will be a different story sooner rather than later as other companies also start producing these cards.

Does the Sony A1 Support CFexpress Type-B memory Cards?

No. Only CFexpress Type-A Memory Cards are supported in the Sony A1.

Check Price & Buyer Reviews for Sony A1

At: Amazon | B&H Photo | Wex Photo UK

Sony A1 Resources

Sony A1 Forum & Facebook Group

If you are looking for further help and advice on the a1 or would simply like to share your photos and videos, then please head over to our new Sony A1 Forum. If you prefer Facebook then I also run the Sony A1 Shooters Group.

Sony Alpha Forum

About Timothy Mayo

I love shooting wildlife the most but will happily point my camera at pretty much anything. I started Alpha Shooters in 2017 to share my own photographic journey and experiences shooting with Sony Alpha. The site has since evolved into a popular community and resource. You can find out more about my story here or follow me on Instagram if you wish. I also have a YouTube Channel but haven’t published much content over the past year due to spending more time changing smelly nappies and also launching our community forums. However, I do hope to get back to creating content again there soon!

Reader Interactions

Comments

  1. Joris

    Thanks Tim.

    I think it is very strange that the biggest CF Express card is still just 160GB, which is just nog enough if you have to burst a lot with an A1. The A1 is made for big action but they do not make big memorycards. My friend has the R5 and he has got CF Express 512GB cards. Also the price for Sony is relatively high.

    The file size of pictures of A1 (CRAW) is still around 50mb while it is only like 25/30 mb from the R5 (45 MP).

    Reply

    • Timothy Mayo

      Hi Joris. I expect we will see 320GB CFexpress Type-A cards soon enough although the price might put many off unless there’s a nice reduction in price with their release. If you don’t need to shoot simultaneously to both cards then you could write to the second when the first is full. CFexpress Type-B cards are definitely a lot cheaper per GB. Although I recently tested them in the Canon R3 and in camera they are only writing at around 400 MB/s compared with around 600 MB/s for Type As in the A1, despite Type-B cards supporting much faster write speeds. The latest Sony A1 Firmware v1.30 has also added Lossless Compressed RAW files in S, M, and L (small, medium, or large). Selecting L size preserves the same image quality as an uncompressed RAW format (according to Sony!) while reducing the file size to around 21MB. I will do some new buffer tests with the new formats soon.

      Reply

    • Timothy Mayo

      I’m afraid not Jon. I didn’t think too many people would be purchasing an a1 to then use the slowest memory cards. I also fried my brain doing all of those buffer tests, adding any more cards would have sent me over the edge! 🙂

      Reply

  4. Woods

    Nice review! Look forward to seeing the real on camera test for a7r4/a7r4a as well. The real tests tells more than specifications.

    Reply

    • Timothy Mayo

      Thank you. I do hope to do some similar buffer tests for the a7R IV soon, unfortunately I don’t have the latest A version but the performance should be similar when it comes to writing to the cards.

      Reply

  6. Tony

    When I format a 160GB CFexpress Sony card, and I’m recording lossless compressed RAW to it, the A1 reports it as having space for over 2200 images, rather than 1900. I know that’s an estimate, but I have fitted more than that onto a card.

    Reply

    • Timothy Mayo

      Hey Tony. I grabbed those figures from Sony’s manual so it is possible that they might be slightly off. I’ll have to remember to check next time I have the a1 in my hands, unfortunately it was just a hire for Christmas and has gone back now. Bit of a relief actually as I don’t need to worry about breaking it!!

      Reply

  7. David Lyle

    Tim, this website is a great find and valuable resource for me. When testing the various cards on the A1, did you record the number of images to fill the buffer, and time to clear the buffer, as you did for the A7iv? I found this extremely useful.
    Also, did you look at equivalent data when shooting raw files in APSC mode? I know that this might seem a waste of a 50MP sensor, but under certain circumstances, shooting long bursts without filling the buffer just might make the difference.
    Many thanks
    David

    Reply

    • Timothy Mayo

      Thanks for your comment David and I’m glad to hear that you like the website. I’ve not yet tested all of my cards in the A1 like I have with the A7 IV because I don’t own the A1 and it has been difficult to rent here. That said, I hope to be able to rent one in January and will then be testing all of my cards similar to what I’ve done with the A7 IV. I might take a look at the APS-C mode too as I know some people are using this. Have a great Christmas!

      Reply

      • David Lyle

        Tim, just received my A1 today (from Panamoz) and just working my way through the menus.
        If the memory card testing doesn’t require any specialist equipment, I could conduct a few tests for the benefit of the website; please let me know if that would be any help to you.
        David

      • Timothy Mayo

        That’s a very nice Christmas present David, just in time too! Thank you very much for your kind offer to help, but I should be ok as all being well I’ll be collecting the A1 on Friday for a 12 day hire, there was a 12 day for the price of 2 offer on over Christmas. No specialist equipment is needed though, just a lot of memory cards! Have a great Christmas and enjoy your new A1! 🙂

    • Timothy Mayo

      Hi David. I hope you had a nice Christmas! Just to let you know I’ve now added the buffer test results to the article. I’ve also included a couple of tests in APS-C mode as well, but didn’t test every card in APS-C mode because my sanity couldn’t cope with so many tests! I hope that’s helpful.

      Reply

  8. Chris

    Unfortunately, this comparison is not up to date anymore.
    Sandisk released a UHS-II Card with V90 rating.
    It’s hard to find it because it’s not listed on their website.
    It’s a updated version of the 300MB/s Card.
    Iam using it in my Sony A1 because Sandisk Cards never let me down.

    Reply

    • Timothy Mayo

      Thanks for informing me about the update to the SanDisk cards Chris, I wasn’t aware of this. I’ll get the article updated. All the best, Tim

      Reply

Leave a Reply

Your email address will not be published.