Full Details from Amazon.com : http://www.amazon.com/gp/product/B00FF40FXS?tag=onigi-20

UtechSmart PCI-E to USB 3.0 2-Port PCI Express Card and 4-Pin Power Connector Mini PCI-E USB

With quick and easy installation this USB 30 PCI express IO Card offers a simple solution for connecting to and using USB 30 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 2 USB 30 downstream ports and 1 USB30 20-pin Connector can expand another two USB 30 ports for standard desktop PC
SuperSpeed USB 30 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 X1X16 slots Backwards compatible with USB 20 and 11 devices
Operating System Compatibility Windows XPVista78