I'm suffering from this problem to. The only thing I've tried in osx is running spore with maxed out settings but it didn't make the computer crash.
In XP running fallout 3 I've tried i bunch of different drivers with no difference. The thing is even if I max the fans with SMCfancontrol and lower the game setting to minimum the game crashes after 5 minutes to two hours. But it is better then with the fans at standard settings
I've logged the temperatures leading up to the crashes and they are high but not thermal protection high, this is four examples:
Seconds GPU HD0 Core 0 Core 1 Core Ambient
80197 83,0 34,0 77,0 77,0 83,0 0,0
80200 83,0 34,0 77,0 76,0 82,0 0,0
80203 83,0 34,0 76,0 77,0 83,0 0,0
42709 80,0 33,0 70,0 72,0 80,0 0,0
42712 80,0 33,0 73,0 73,0 80,0 0,0
42715 80,0 33,0 73,0 73,0 80,0 0,0
56814 73,0 33,0 62,0 62,0 73,0 0,0
56817 72,0 33,0 61,0 61,0 71,0 0,0
56820 71,0 33,0 60,0 60,0 71,0 0,0
69928 79,0 34,0 72,0 73,0 79,0 0,0
69931 80,0 34,0 73,0 73,0 79,0 0,0
69934 80,0 34,0 73,0 73,0 79,0 0,0
Message was edited by: meckis