I bought two R9 280Xs, both run fine however one of them overheats dramatically under load until i get a BSOD. Read some other threads on overheating and the answer is usually more cooling so after playing with the fan arrangement with no results I decided to just throw 4 120mm Delta fans in it, 2 of which blow directly onto the problematic card. It helps to slow the overheating but as soon as it hits 85c I just shut it off, the other card stays around 60c. Diamonds tech support is absolute shit and I can't get any help with it from them. Any other suggestions I can try?