I didnt make the upgrade, i got asked to help when he messed it up. The 6670 does not have a 6 pin power connection. Only thing i can think of is that the card is bad and I am about to test that in my PC (as much as i dont want to). I was just wondering if someone else had a similar problem or if i overlooked something.
For the record also, i told him that upgrading his Gcard wouldnt make WoW run better....but kids these days =\