I don't know about games...but I did some google research and I found Prime 95
Ran it for 15 minutes and the Max temperature it reached was 48 Degrees, and stopped, I.e, speedfan put a green tick on it, and it occasionally dropped to 47.
So I am guessing the temperature reading is not "frozen" and if the temperatures are correct, I am not complaining, 48 Degrees Max is absolutely great for a newer C2D CPU!