This 2 port usb 30 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 30 superspeed ports superspeed usb supports transfer rates up to 48 gbps thats up to 10 times faster than usb 20 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