USB 3.0 is the new super speed standard for hardware and cables supporting speeds up to 5Gbps. Our USB 3.0 Express cards are built to specification. Due to hardware restrictions actual speeds may vary. Specification Compliant with USB 3.0 specification REV 1.0. Compliant with Intel xHCI Rev 0.96. Compliant with USB 3.0 (5Gbps) 2.0 (480Mbps) and USB 1.1 (12Mbps) specification. Each USB 3.0 connector supports up to 900Ma. Built in DC jack for extra power. Supports Express card 34mm slot. Support Hot Swapping and Plug n Play. Compatible with Windows XP Vista and Windows 7.