The pexusb4dp is a low profile 4 port usb card designed for versatility and performanceproviding 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 installationcapable of adapting to virtually any pc case form factor the low profile usb card includes a standard profile b