I have a Sandisk Extreme Pro V30 and bought this V90 to use for 4K video. Tested on my PC using CrystalDiskMark 8.0.4 and the V30 was faster in all categories. I was surprised! So I tested the card with my Sony RX100 VII camera and took a series of 100 pictures. The V30 finished writing to the buffer in 1 minute and 37 seconds while the V90 finished in 2 minutes and 6 seconds! I really don't know what's wrong with this card, but I will definitely be returning it!
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