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 should I do if I cannot delete or format my microSD/SDHC/SDXC card due to write protection? What is the meaning of the"Class Speed Rating" shown on SDHC cards? Why do I need to format the memory card before using it for the first time? Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started