IMac graphic errors after high load

Hi guys,
whenever i play warcraft 3 for like 30 minutes, my iMac alu (bought on september 2007) produces colored triangles and surcafes all over the screen rendering my iMac unuseable till reboot. I see GPU Temp raising up to 70°Celcius (monitored with iStat) which seems a lot to me. Also my fans stay at 1200rpm all the time (also in idle). Can someone help me with this issue? I think a current iMac should really be able to handle warcraft 3..
Thanks in advance,
derblubber

Could anyone help me with this?

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