PCIe - 2x USB3.0 Supports PCI Express Base Specification Revision 2.0. Single-lane ( x1) PCI Express throughput rates up to 5 Gbps. Compliant with Universal Serial Bus 3.0 specification Revision 1.0. Compliant with xHCI (eXtensible Host Controller Interface) specifications Revision 0.96. Supports simultaneous operation of multiple USB 3.0, USB 2.0 and USB 1.1 devices. Supports USB data transfer rate of 1.5/12/480/5000 Mbps. Expands two external USB3.0 Super-Speed ports on the system. Each USB port supplies maximum +5V / 900mA power output to USB device. Built-in 4-pin power connector for receiving extra power supply from system. Hot-swapping feature allows you to connect/disconnect devices without powering down the system. Driver supports for Microsoft Windows XP, 2003, Vista, 2008 and 7 operation system. Certified by CE, FCC, RoHS, and Microsoft WQHL approval.