UtechSmart 7-Port Superspeed USB 3.0 PCI-E Express Expansion Card with 5V 4-Pin Power Connector for Desktops [ Chipset: Renesas &micro;PD720201 + VLI VL812 ] SuperSpeed USB 3.0 supports transfer rates of up to 5Gbps - The actual transmission speed is limited by the setting of the device connected. 7 USB 3.0 downstream ports for standard desktop PCs. Backwards compatible with USB 2.0 and 1.1 devices. 5V 4 pin connector to power USB devices from your PC power supply; The PCI-E Port only support PCI-E X1/X16 slots. Operating System Compatibility: Windows XP / Vista / 7/8.