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 meaning of the"Class Speed Rating" shown on SDHC cards? Why is it that I cannot read the correct capacity of my newly purchased SD card, or that the display of capacity it becomes incorret after formatting? How to format the flash drive to NTFS in Windows XP? Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started