i am using core to quad Q6600 with 8gb ram and amd radeon hd 7870 2gb ddr5 256bit .. with 400watt PSU ...it cause alot heat right after i start playing game at max resolution and it reachs 83 c in 20mins i started playing and my system shutdown it self automaticly ....does all this happens coz of lack of POWERSUPLLY power