So I built this pc in july of 2011, flawless performance since then. In the last few weeks ive done some upgrading and was enjoying nice performance until yesterday my fps in Diablo 3 dropped from ~60 to about 0-10 fps. Tried other games (BF3, LoL, CS 1.6) with extremely slow load times and then the inevitable frame rate
I restarted, reinstalled video drivers, checked connections, temperatues for cpu/gpu are low even under load. I rebooted multiple times and was able to use it flawlessly for about 5-10 minutes. After that brief period I was experiencing the same issues as before.