Quote Originally Posted by Un4given
With PCI-e the socket type and the actual bus are not tied together. In this case it means there is a x16 socket, so you could plug in a video card, but the number of lanes means the speed/bandwidth will only be the equivalent of a x8 PCI-e.

It should also be noted that there is no functional performance difference between operating at 8x and 16x at this point in time.