Is it possible to upgrade the grapic card from ATI 4670 to ATI 4850

Hello,
i bought a 27inch iMac with an ATI Radeon 4670 grapic chip. At the moment the peformance in Games is enough for me. But for the upcoming PC-Games like Diablo 3 or Starcraft 2, i need a better grapic chip.
So is it possible afterwards to upgrade the 4670 to 4850? It must be a MXM Standard. From there it should not be a problem or?
I hope someone can answer my question.
Sorry for my bad english
W. Jacob

Hi-
Unfortunately, it is both brutally difficult and (of course) warranty voiding to attempt such a thing.
If you are adventurous, take a trip to ifixit.com to get an idea of the difficulity for swapping out the daughterboard graphics chip.
The only way to squeeze the most performance out of your iMac for gaming is to install 64 bit windows 7 via bootcamp, and max out with 16gb ram. Not much you can do besides that.
Message was edited by: kguy

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