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? How are SLC (Single-Level Cell), MLC (Multi-Level Cell) and TLC (Triple-Level Cell) Flash different from one another? Why is the actual storage capacity of the product slightly less than the volume specified on the product's package? Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started