Silverstone Tek EC03B-P PCI Express Card with USB 3.0 Internal 19-pin Dual Port Connector with USB 3.0 Front IO ports Unique 19-pin dual port USB 3.0 internal connector PCI Express 2.0 with single lane(x1) throughput 5Gbit/s Supports simultaneous operation of multiple USB 3.0/2.0/1.1 devices Adds two external USB 3.0 SuperSpeed ports to your system Built-in power connector to receiving extra power from system Transmitting Speed: USB 3.0(5Gbit/s), USB 2.0(480Mbit/s), USB 1.1(12Mbit/s) Enclosure interface: USB3.0 (Max. 5Gbps) compatible with USB 2.0 USB 3.0 controller: NEC uPD720202