Koutech 4-Port SuperSpeed USB 3.0 PCI Express (x1) (4x Ext) with 15-pin SATA Power Connector Fully compliant with one-lane (x1) PCI Express 2.0 specifications Four (4) external 5Gbps SuperSpeed USB 3.0 ports and USB 3.0 complies with Intel eXtensible Host Controller Interface (xHCI) SuperSpeed USB 3.0 offers 10 times performance increase over Hi-Speed USB 2.0 with up to 5Gbps maximum transfer rate Built-in with 15-pin SATA Power Connector for added power source to better support power hungry bus-powered devices Fully Plug-N-Play and Hot Swap compatible and supports 32-bit & 64-bit Windows Vista/Server 2008/Windows 7/Windows 8