Full Details on Amazon.com : http://www.amazon.com/gp/product/B005G2JFMG?tag=tsukuyomi-20

StarTech.com 2 Port SuperSpeed USB 3.0 PCI Express Card with UASP - SATA Power

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
Uses a SATA power connector for compatibility with newer systems that have limited or no LP4 power supply connections to ensure maximum power for USB devices
Provides two external USB 30 connections
Fully compliant with USB 30 revision 10 specifications and Intel xHCI rev095 specifications with transfer rates up to 5 Gbps
Built-in optional SATA power connector for bus-powered USB devices