I'm using ATI HD4870 on a P5E WS Pro board that uses the x38 chipset. GPU-Z shows "PCI-E x16 @ x16" when installed in the top slot nearest the CPU. When in the bottom slot it says "PCI-E 2.0 x16 @ x16 2.0". CCC and everest says its running at x16 2.0 in either slot. Is this an error in GPU-Z? or could one slot be limited to 1.1 and the other 2.0?