This USB 3.0 PCIe Card from Western Digital gives your computer two ports that transfer data at blazing fast speeds. This PCIe card fits into an available PCIe slot on your Windows XP, Vista, or 7 PC and provides you with two USB 3.0 ports. With the USB 3.0 interface, you can experience data transfer speeds of up to 5 Gbps, more than ten times faster than USB 2.0. In addition, these ports are backwards compatible with USB 2.0 devices. You will find the extremely fast USB 3.0 data transfer speeds great for use with USB 3.0 external hard drives or burners, among many other peripherals.