When playing intensive games (FIFA09 is fine, but not COD5), my GPU seems to overheat after ~30 minutes play and the computer either restarts immediately or just powers down, and I have to let it cool for 5/10 mins. I have an ATi x1950 Pro 512mb and two monitors connected. I'm running it on low graphics, 800x600 (because this is a persistent problem). Earlier, I took out a redundant modem which was below the GPU, and this worked okay for a while, but now it has come back. Idling on windows, its running 61C, which seems fairly hot seeing as I'm not even running anything. Any advice?