Koutech Dual Channel SuperSpeed USB 3.0 PCI Express (x1) Card with 4-pin Molex Power Connector Two (2) external 5Gbps SuperSpeed USB 3.0 ports Up to 5Gbps maximum transfer rate SuperSpeed USB 3.0 offers a performance increase of 10 times over Hi-Speed USB 2.0 Built--in with 4-pin Molex power connector for added power source to better support power hungry bus-powered devices Fully Plug-N-Play and Hot Swap compatible and supports Windows XP/Server 2003/Vista/Server 2008/Windows 7/Windows 8