UtechSmart PCI Express to SuperSpeed USB 3.0 4-Port Expansion Card With quick and easy installation, this USB 3.0 PCI express I/O Card offers a simple solution for connecting to and using USB 3.0 devices on your standard desktop PC. Enjoy copying videos, music, photos, data files between USB devices and the computer at blazing fast speeds. Extend with 4 USB 3.0 downstream ports SuperSpeed USB 3.0 supports transfer rates of up to 5Gbps - The actual transmission speed is limited by the setting of the device connected. The PCI-E Port supports PCI-E X1/X16 slots; Backwards compatible with USB 2.0 and 1.1 devices. Operating System Compatibility: Windows XP/Vista/7/8.