The 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 camera. 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 Name | 32GB | 64GB | 128GB |
| Sony G Series UHS-II | Amazon | Amazon | Amazon |
| B&H | B&H | B&H |
Real-World Memory Card Performance
The UHS-II memory card gains its speed from an extra set of pins. While the card has the capability of performing about 300MB/s read a write, it will default to the 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 camera. It shines in UHS-II cameras but will default to UHS-I speeds in cameras that are not designed to take advantage of those 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 Name | USB 3.0 Read | USB 3.0 Write |
| Sony G Series UHS-II 64GB | 259.2 MB/S | 234.5 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.
Compatibility
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?
The 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.
Reliability
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.
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