This 2-port USB 3.0 SuperSpeed PCI Express card adds SuperSpeed USB capabilities to your computer. Simply install this card into an available PCI-E slot on your computer to add two USB 3.0 SuperSpeed ports. SuperSpeed USB supports transfer rates up to 4.8 Gbps - that's up to 10 times faster than USB 2.0! This PCI Express Card enables fast transfer of large amounts of data from such devices as external hard drives, memory card readers, real-time video cameras, and other data-intensive USB devices.Please Note: USB 3.0 (4.8 Gbps) provides TEN TIMES the capability of USB 2.0 (480 Mbps); it also provides up to 900 mA power instead of the 500 mA available with USB 2.0. Type A connections are backwards compatible to USB 2.0 and even USB 1.1. Finally, while USB 2.0 cables will work with USB 3.0 devices (at the lower USB 2.0 transmission speed and power), you won't enjoy the SuperSpeed of USB 3.0 without connecting with USB 3.0 cables!