I know I'm just being paranoid, but I built a second computer a little while back but I just realized while doing some wiremanagement that the two motherboards (both Abit NF7-S rev2) there are a few slight discrepencies in the boards, well other then the fact that the northbridge fan on one of them is LOUD as hell. Off the top of my head, the little bar on the side of the processor socket is metal on one and plastic on the other... is there a reason for this or am I just paranoid?