Well for some reason my system is fully stable. However, after ~30mins of L4D it will freeze and I have to restart pressing the button. The first time is always ~30mins, 2nd time is always after ~1 hour.

Everything is stable but the game will just freeze. It never happened to me with Call of Duty 4 or WaW. Counter Strike also worked good. I have no idea...

Im on 1104 right now