I bought two of these cards and was only able to get them to work at 190MB/s write and 390MB/s read. Nowhere are 330 MB/s writing and 530 MB/s reading. I'm really not too surprised considering they only cost $90 each. They still work well and are faster than any $90 SD card. You work for what I need. I just wish they advertised a little more honestly.
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