Alright, so me and my brother both have the same hardware. We both have a HD4870, 4gb ram. The only difference is the processor and the power supply. I have an E8500 @ 3.16GHz and he has an E7400 @ 2.80Ghz and his games work better than mine. He uses Windows XP and I use Windows Vista (because XP and Win7 showed me BSOD). I was using XP and the games ran bad (installed with a dirty cd, showed me errors all the time). So do you guys think it's the problem with the power supply or windows?