I just bought a new 4870 iceq4 turbo. viewing it in catalyst control center, it runs at 100+ celsius idle. if i play a game, it eventually causes my computer to turn off. i have the sides/top off my computer, and a 18" house fan blowing on it. i have every fan in my computer working. the benchmark on iceq4's is about 60 celsius under heavy load... is my coolant system broken?