The Sony M series card was Sony first UHS-II card on the market and is a solid card with great performance, but it’s not a very fast card in terms of read speeds compared to the new Sony G cards.
The Sony M card has a max read speed of 260MB/s and a max write speed of 100MB/s. When using this card in most UHS-II cameras you wont be able to maximize the speed and performance of the camera with this card. However, in some cameras like the Panasonic GH5, it will work great because that camera has some write speed bottlenecks.
The main advantage of the Sony M card comes with read speeds. Offloading your data from your card to your computer very quickly. In real world shooting, unless you’re doing a lot of burst photography, this card will work great plus you get the fast UHS-II read speeds.
Sony SF-M Series UHS-II Memory Card Sizes
The Sony SF-M UHS-II card comes in three sizes – 32GB, 64GB, and 128GB.
| Memory Card Name | 32GB | 64GB | 128GB |
| Sony M Series UHS-II | Amazon | Amazon | Amazon |
| B&H | B&H | B&H |
Real World Memory Card Performance
The Sony M series UHS-II card performs very close to it’s rated specs when using a good UHS-II memory card reader in Windows 10.
| Memory Card Name | USB 3.0 Read | USB 3.0 Write |
| Sony M Series UHS-II 64GB | 253.2 MB/s | 91.62 MB/s |
Compatibility
Compatible with UHS-I devices and is also a great card for recording 4k with Sony’s XAVC S video codec.
Keep in mind the SDHC or 32GB version of the card is only 32-bit and will have a 4GB file size limit.
Speed Class: U3 / Class 10
UHS-I / UHS-II devices
Learn more about the specs and what all those little symbols written on memory cards mean.
Reliability
This memory card is X-Ray proof, dust-proof, magnet-proof, static proof, shock proof, water proof and can operate in extreme temperatures.
Limited 5-Year Warranty
Which Sony Cameras Support UHS-II?
There are a few cameras by Sony that support UHS-II cards, however, the M series card, because of it’s slower write speeds also will perform great in a UHS-I camera and you still get the UHS-II read speeds when it comes to offloading your data from a UHS-II memory card reader. This makes the M series card a great option for those looking for faster transfer speeds, but don’t necessarily need faster read speeds. In simpler words, it’s a great card for shooting video.
UHS-II USB 3.0 Memory Card Readers
To take advantage of the fast read speeds of the Sony UHS-II M card, you will need a USB 3.0 UHS-II memory card reader.