I have two cards in one. (HD 4870X2)I dont have any other option to test my card in. Could this be a faulty card? It cost me 400$....
Might be a faulty card (the BSOD code may give us some clue's), could also be a problem with the motherboard or power supply although unlikely.
Highly unlikely to be software related if you formatted your drive and re-installed the O/S.
Any warranty left on the card?