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With the release of firmware version 4.00 I decided to retest them and now they are now managing 132.50MB/s shooting uncompressed RAW, so Sony has definitely tweaked something.

I did report this to Sony but didn’t receive any feedback. Important note: When I tested these cards with firmware version 3.10 they were only managing 107.27MB/s when shooting uncompressed RAW, but JPEG speeds were as they should be. Here are my in-camera speed test results using a 64GB card: Image TypeĬompressed RAW (25MB) + JPEG Extra Fine (18.3MB) Shooting uncompressed RAW these cards actually have an in-camera write speed of around 132.50MB/s. Note: Sometimes these cards can be a little tight in the memory card slot compared to standard SD cards. The Sony SF-G Tough cards are rated V90 for video and have a claimed read speed of 300MB/s and a write speed of 299MB/s. The 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. Tough memory cards are 18 times stronger than standard 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 dustproof with an IP6X rating. If you find this article helpful then you may also like my Sony A7 III Accessories Guide and Lenses Guide. These tests were done using my Sony a7 III and 64GB SDXC UHS-I memory cards. * Shooting Uncompressed RAW Best UHS-I Memory Cards These tests were done using my Sony a7 III and 64GB SDXC UHS-II memory cards. If you scroll down a little further you will find my complete speed and buffer test results for each card. Here are my in-camera card speed comparison results for all of the UHS-II and UHS-I CD cards that I’ve tested so far in my Sony a7 III. Beeway Water & Shock Resistant Memory Card Case.Sony MRW-S1 High Speed UHS-II USB Memory Card Reader/Writer.