Hi, i recently got a new pc with an I3 540, Gtx 650 1GB, 8GB RAM and a PSU of 400 watts, the thing is that when im playing any game for like 10 minutes my fps drops so much! before that i get 60 frames stable but 10 min later i get 20-30 fps and thats it! it doesnt get over that, i dont know if it has something to do with my PSU or is it bottlenecking? i simply dont know please if someone know what the problem is help me out