Sony G UHS-II SD Memory Card Review

Sony G Series UHS-II Memory Card ReviewThe Sony G series memory card is Sony’s fastest UHS-II memory card with read speeds rated at 299 MB/s and write speeds rated at 300MB/s.

The Sony G UHS-II cards are great cards for any UHS-II cameras. They work great for Fujifilm and Sony cameras and are one of the best memory cards you can buy for the latest Sony UHS-II cameras.



Sony SF-G Series UHS-II Memory Card Sizes

The SF-G Sony card is available in three sizes. 32GB, 64GB and 128GB. To get a 256GB UHS-II memory card from Sony you’ll have to go with their slower M card.

Memory Card Name32GB64GB128GB
Sony G Series UHS-II AmazonAmazonAmazon


Real World Memory Card Performance

The UHS-II memory card gains its speed from an extra set of pins. While the card has the capabilities of performing of about 300MB/s read a write, it will default to rated bus speed of whatever device is used. So it will still function in cameras and memory card readers that are not rated for UHS-II and will simply default to those speeds. The same is true with how it performs in each cameras. It shines in UHS-II cameras, but will default to UHS-I speeds in cameras that are not designed to take advantage of that extra sets of pins.

Testing the card with Windows 10 shows slightly lower results than what the memory card is capable or at least what the card is rated for. You can see how the Sony G UHS-II cards stack up against the rest with this guide to memory card speeds.

Memory Card NameUSB 3.0 ReadUSB 3.0 Write
Sony G Series UHS-II 64GB259.2 MB/S234.5 MB/S


Which Sony Cameras Support UHS-II?

Sony has recently adopted UHS-II in a few of their cameras. Right now you can see how this card performs in their cameras by seeing my speed tests.

UHS-II Cards Sony A9

UHS-II Cards Sony A7r III



The G series UHS-II card comes in two configurations, SDHC and SDXC. The SDHC version is 32-bit and runs with a fat-32 file system. The SDXC card runs at 64-bit with an exfat file system.

What does this mean?

32-bit card will have a 4-GB file size limit, the 64-bit will not. This will make a difference when recording long videos.



This memory card is X-Ray proof, shock proof and can operate in temperatures ranging from -13 to 185°F.

Limited 1-Year Warranty


UHS-II USB 3.0 Memory Card Readers

To take advantage of UHS-II speeds when transferring files from your card to your computer you’ll need to get a good UHS-II memory card reader. I’ve tested quite a few so check out that comparison.