2007 iMac5,1 GPU overheating - anything to be done?

Hi, I'm having increasing problems with this 2GHz Core 2 Duo iMac which range from screen artefacts to freezing. Orginally this only occurred when running graphics-intensive games, but now even full-screen video can be problematic.
According to iStat Pro, the problems occur when the GPU temp rises over around 60C. I'm using SMCFanControl to try and keep temperatures down, but I'm having to gradually raise fan speed. Is there a more permanent fix, or should I just reconcile myself to the fact that the machine is on the way out?

I am starting to wonder if graphics intensive games are frying these GPUs after a couple of years.
If you had bought Apple Care it would still have a few months left and Apple should repair/replace it under warranty. A new logicboard with GPU is easily US$700+. The Apple Care would have more than paid for itself.
Aside from what you are doing with smcFanControl I do not think that there is much else you can do. No air conditioning here, just house fans. In summer we run an Early '06 17" iMac Core Duo with smcFanControl and the fans around 2500 rpm, and jack them up to 4000 if the guys are watching a lot of video. I tell them to not let the GPU temp get above 55°. Not a hint of issues.
Dah•veed

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