Koutech 4-Port SuperSpeed USB 3.0 PCI Express (x1) (3x Ext + 1x Int) with 15-pin SATA Power Connector Fully compliant with one-lane (x1) PCI Express 2.0 specification Three (3) external 5Gbps SuperSpeed USB 3.0 ports and one (1) internal 5Gbps SuperSpeed USB 3.0 port SuperSpeed USB 3.0 offers 10 times performance increase over Hi-Speed USB 2.0 SuperSpeed USB 3.0 is backwards compatible with USB 1.0/1.1/2.0 devices (data transfer rate at 1.5/12/480Mbps) Fully Plug-N-Play and Hot Swap compatible and supports 32-bit & 64-bit Windows Vista/Server 2008/Windows 7/Windows 8