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Definition: SD Express

An SD card category that uses the PCI Express (PCIe) and NVMe interfaces. Introduced in 2018, SDHD, SDXC and SDUC cards are available as SD Express cards, which are backward compatible with the myriad SD devices in use.

Over the PCIe bus, an SD Express card plugged into an SD Express host can reach up to 985 MB/sec, a 50% increase over the UHS-III bus in full-duplex mode. See SD card classes, SD card, PCI Express and NVMe.

SD Express Logos
As time marches on, these logos will appear on SD Express cards. (Images courtesy of SD Association, www.sdcard.org)