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 FAT32 and exFAT? Which format should I format my memory card to? My Laptop asks me to install the diver after I insert the SD/SDHC card into the internal card reader. Please provide me the driver. Why can't my digital camera use a higher capacity flash card? Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started