Quote Originally Posted by slim142 View Post
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
Y'know, when L4D just came out, I was having freezing/sound loop problems with that game. It would be completely random. After 2 PSU's later, the numb skull I am, never checked the UPS that I had my system connected to. Turns out that the backup power supply went buh-bye. After I connected my system directly to the wall socket, the freezing went away.

Not sure if your problem is related to power to the gpu's, but the symptoms seem to be the same.