http://tinyurl.com/outg92o
Silverstone Tek PCI Express Card with 2x USB 3.0 External Ports and Internal 19 Pin Dual Port Connector (EC04-P)
USB 3.0 with two external standard Type-A ports and one dual port internal connector
PCI Express 2.0 with single lane (x1) throughput 5GB/s
Supports simultaneous operation of multiple USB 3.0/2.0/1.1 devices
Adds four total USB 3.0 ports to your system
Built-in power connector to receive extra power from system power supply