Koutech 2-Port SuperSpeed USB 3.0 PCI Express Controller Card (2xExt) with Regular and Low Profile Brackets and 15-pin SATA power connector Fully compliant with one-lane (x1) PCI Express 2.0 specifications Two (2) external 5Gbps SuperSpeed USB 3.0 ports SuperSpeed USB 3.0 offers 10 times performance increase over Hi-Speed USB 2.0 Built-in with 15-pin SATA power connector for added power source to better support power hungry bus-powered devices Supports Windows XP/Server 2003/Vista/Server 2008/Windows 7