SUNEAST microSD Express Card

The microSD Express Card moves past UHS-I microSD entirely, reading at 890 MB/s using the PCIe/NVMe-based Express interface built into current handhelds and game consoles. Write speed runs 750 MB/s on the 256 GB card and 810 MB/s on the 512 GB card, which is the difference this format makes for faster game loads and app installs on compatible hardware.

It falls back to UHS-I mode automatically in a reader or device that does not support microSD Express, though at the reduced UHS-I transfer rate in that case. Application Performance Class A1 covers random I/O for apps run from the card, and it carries Class 10, U3 and V30 sustained transfer ratings with a five year warranty from date of purchase.