What are UHS interface and UHS Speed Class? Category : Specification / Capacity / Performance UHS (Ultra High Speed), the fastest performance category available today, defines bus-interface speeds of up to 312 Megabytes per second. It is exclusively designed for SDHC and SDXC memory cards, and compatible with SDHC and SDXC devices. Is the answer helpful? Related What is the difference between SD, SDHC and SDXC cards? What is the meaning of the"Class Speed Rating" shown on SDHC cards? Why does my digital camera/camcorder always stop recording a few minutes after I start to record Full HD videos at 1920 x 1080 resolution even if the SDHC card has enough storage space? Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started