The performance boost for the new generation of ultra fast usb peripherals 4x usb 30 ports vl805 chipset downward compatible to usb 2011 devices supported data transfer rates super speed 5gbps high speed 480mbps full speed 12mbps and low speed 15mbps supports plug and play and hot swapping compliant with universal serial bus 30 specification revision 10 compliant with pci express base specification 20