The pexusb4dp is a low profile 4 port usb card designed for versatility and performance providing simple system expansion for added peripheral connections this pci express usb card adds 3 external usb 20 slots and 1 internal usb 20 slot with support for high speed usb 20 data transfer rates of up to 480 mbps and includes whql certified drivers and easy plug and play installation features backward compatible with usb version 11 compatible with pci express x1 x2 x4 x8 and x16 slots co