I bought a 512GB gigastone microSDXC card and was a bit skeptical but that's the real deal. Passed tests with FAKEFLASHTEST v1.1.1 and H2testw. The card was tested at 98MB/s reading and 59MB/s writing in Crystal Disk Mark v8.0, making it an average speed, although slower to write than the manufacturer's advertised speed. 80MB/s. This was the only test using a single card reader on a specific YMMV card. For buying a legitimate, high-capacity, "normal" speed card, this is one of the best options.
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