Koutech 4-Port SuperSpeed USB 3.0 PCI Express (x1) (3xExt+1xInt) with 15-pin SATA Power Connector Four (4) 5Gbps SuperSpeed USB 3.0 ports Three (3) external + one (1) internal connectors Built-in with 15-pin SATA Power Connector for added power source to better support power hungry bus-powered devices Ideal connection for digital cameras, scanners, printers, external CD/DVD/Blu-Ray writers, hard disk drives, flash memory drives and etc. Supports Windows XP/Server 2003/Vista/Server 2008/Windows 7/Windows 8