SilverStone created an excellent extension card product, the EC04, which connects to the motherboard via single lane PCI Express 2.0 to support two external and a dual port USB 3.0 connector for maximum compatibility and flexibility. This card is a great add-on for systems that require connections to multiple USB 3.0 devices such as SilverStone’s own USB 3.0 enclosures RVS02 and TS07.

• 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 5Gbit/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

Model No.:	SST-EC04
Power requirement:	5Vdc via peripheral 4pin power connector
Operating system support:	Windows XP, Vista, 7(32bit/64bit)
Form factor:	Low profile single lane (X1) PCI Express 2.0
USB 3.0 controller:	TI TUSB7340
USB Ports:	Dual port USB 3.0 support (one internal connector)
Enclosure Interface:	USB3.0 (Max. 5Gbps) compatible with USB 2.0
USB bus power output:	5Vdc / unlimited current
Transmitting Speed:	USB 3.0(5Gbit/s), USB 2.0(480Mbit/s), USB 1.1(12Mbit/s)

07-29-2013
Reviewer: madcratebuilder (2)
This card well give you two USB 3.0 ports at the rear of the case plus it has a multi pin header for adding a USB 3.0 bay devise. My 990fxa mobo had two internal headers and I needed one additional header. This EC04 does that, the drivers work with XP-32 and with Win7-64. The data path is as fast as the embedded USB on my mobo. I liked enough to buy a second one for my XP box. Good support from SilverStone, I had a minor issue with the XP install and CS got back to me within 24hrs. They solved the issue.