FAST USB 3.0 PCI-E PCIE 4 PORTS Express Expansion Card Adapter.Super fast and high-capacity transfer solution, stable and reliableFully compatible with PCI Express Base Specification Revision 2.0Supports simultaneous operation of multiple USB 3.0, USB 2.0, and USB 1.1 devicesSupports 4 downstream ports for all speedsBuilt-in 4-pin power connector for receiving extra power supply from the systemSupports Windows 7 (32-bit/64-bit), Windows Vista (32-bit/64-bit), Windows XP