Imac freezes up with WoW

Its perfectly OK at all other times. Temperature monitor shows that only with WoW (Not Halo or Second-life) does the graphics card heat go into the 90's. Although the pointer still moves and the sound continues, nothing can be clicked on or selected in or out of the game - and a rear-button reset is necessary. sometimes the screen corrupts into artifacts first - sometimes not.
Someone else has posted exactly the same situation before (it's identical) but that thread was locked. Here it is:
http://discussions.apple.com/thread.jspa?messageID=4432355&#4432355

I have the same issue which started with WoW but has recently extended to other apps on my iMac 24.
I am convinced it is a hardware issue, finger pointed at the graphics card. Over the last 2 months it has progressively worsened and now is not just a WoW issue.
WoW techs named "overheating" as the issue. So I started using smcfancontrol2 to crank up my iMacs fans and low and behold ... the problems stopped. However, the temperatures that the iMac crashes at do not seem to be abnormally high (110 - 115 F). I keep the house around 76 F during the summer days so yes, it is a little warmer than winter but well within my expectations of an acceptable environment.
Apple has advised me to take it in for servicing. Hopefully, the problem will be reproduceable at the service centre. I can make it happen in 5 minutes just standing in the AH at SW
Everything "passes" in Techtool Deluxe scans.
I re-installed the OS both as a refresh and a complete rebuild but the problem persisted.
I removed my RAM upgrade and put the stock RAM in as well and the problem continued.
The Panic logs all refer to the graphics card and Apple confirmed that.
No resolution yet but you are not alone.

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