Run software update and grab the "iMac EFI Firmware Update 1.4". It fixes the freezes on the new 2009 iMacs with the ATI 4850!
Update 1:
Just a quick note. I have played Fallout 3 under bootcamp, World of Warcraft under OSX with no crashes. Also it seems to run cooler all of the time without any extra noise.
Update 2:
Well, I just put in another 4 hours of Fallout 3 with no problems. The iMac stay quiet under all playing conditions it seems, which is really nice. So, I guess it wasn't a straight heat issue. I also got in another hour with Wow with the graphics setting cranked up to 'ultra'. Not that Wow really pushes anything.
Update 3:
At 24 hours now and I would normally have had about 3 freezes or more. But I have not had one so far. I really think they got a good fix here. I am very happy with it and am glad I did not take my box in to get it fixed or replaced.
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