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V90 sd card reader12/30/2023 ![]() When comparing the speed of the SanDisk V30 and ProGrade V90 cards, the decision to upgrade becomes more difficult because the cost difference is so large. With a slower card, we cannot use this feature. Our GH5s require at least a V60 (60 MB/s minimum write speed) to shoot in 10-bit color. ![]() Some cameras require extremely fast cards to work properly and this is the number to look for. My SanDisk card is a V30 card and these ProGrade cards are V90. This number is shown on memory cards with the letter "V" in front of it. The other important number is the minimum write speed. These ProGrade cards say "250 MB/s." This is the theoretical speed that you should be able to transfer files from the card to your computer. Maximum read speed is usually printed on the front of a card. We all know what the capacity is (we almost exclusively use 256 GB cards now) but very few photographers know about the other two. When buying a memory card, you should only care about three numbers: the capacity, the maximum read speed, and minimum write speed. Understanding Memory Card Speeds and Ratings $80 for this kind of performance boost is totally justifiable and I would recommend that every photographer buy this card reader. You can even transfer two cards at once without losing speed. The ProGrade card reader had a faster maximum top transfer speed that was more consistent even with cheap cards. Both the Transcend card reader and my Lexar card reader transfer at wildly inconsistent speeds but I always assumed that was normal. To my surprise, the ProGrade card reader was significantly faster than the Transcend card reader with both the cheaper SanDisk card and the ProGrade card. I loved this feature but I still expected the performance of the reader to be identical to my Transcend reader. ![]() When I set the ProGrade card reader on my computer tower I was excited to see that a magnet held it securely in place. I certainly assumed that the ProGrade cards, that are almost four times the price, would be faster, but I also thought that all USB 3.1 card readers were the same. Our current go-to cards are the SanDisk 256 GB 95 MB/s maximum write speed which I purchased for around $95. They also sent me an $80 ProGrade card reader. ProGrade recently sent me two 256 GB cards that cost a staggering $380 each. ![]()
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