Koutech 4-Port SuperSpeed USB 3.0 PCI Express (x1) (2xExt+1xICC) (with 4-pin Molex power connector) Two (2) external 5Gbps SuperSpeed USB 3.0 ports Two (2) internal 5Gbps SuperSpeed USB 3.0 ports via Intel Internal Connector & Cable (ICC) 20-pin connector Comes with both regular height & low-profile brackets Built-in with 4-pin Molex Power Connector for added power source to better support power hungry bus-powered devices Supports 32-bit & 64-bit Windows Vista/Server 2008/Windows 7/Windows 8 & Linux