Full Details from Amazon.com : http://www.amazon.com/gp/product/B002XVVIQE?tag=onigi-20
StarTech.com 2 Port PCI Express SuperSpeed USB 3.0 Card Adapter PEXUSB3S2
SuperSpeed USB 30 connectivity at up to 5 Gbps and 80 more power than USB 20
Dual profile design to fit into Full or Low Profilesmall form factor SFF systems
Backed by a StarTechcom lifetime warranty and free lifetime technical support
Provides two external USB 30 connections
Fully compliant with USB 30 revision 10 specifications and Intel xHCI rev096 specifications with transfer rates up to 5 Gbps
Built-in optional LP4 Molex power connector for bus-powered USB devices