If you’re wondering why we’re not using an even faster SD card using the newer UHS-III bus, it’s because we couldn’t find a card that even supported the newer interface, which takes speeds to 312MBps in full duplex mode and 624MBps in half duplex mode. The SanDisk Extreme Pro SD Card is rated for read speeds right up to the limit of UHS-II at 300MBps with write speeds rated at 260MBps. We used a 128GB SanDisk Extreme Pro card rated for 300MBps reads and 260MBps writes for our testing. We formatted the card in exFAT, which has seemingly become the standard for most large-capacity SD media. The UHS-II bus can hit 312MBps in full duplex mode and 624MBps in half-duplex mode. ![]() The card is a UHS-II card, meaning it rides on the Ultra High Speed II bus and features a second row of contact pins on the back to hit the higher performance ratings of the interface. ![]() Because this test would be pointless without a fast SD card, we used a 128GB SanDisk Extreme Pro SD card.
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