06-25-2011, 02:46 PM
pci-e has an inbuilt usb system that runs at a slightly reduced voltage than normal usb, this allows for combo cards such as WiFi/Bluetooth and hsdpa/WiFi, not all manufactures connect the pins on the connector for the usb to work and not all bios have support for the usb part to work and sometimes you need a manufacturer specific software to turn it on and off, hope this helps.