Is it possible to replace the GPU of my imac8,1?

10-11  Source: Network gathering  Views:0 

My 2008 iMac with ATI Radeon HD 2600 Pro worked perfectly until I updated from Mac OS X 10.6.2 to Mac OS X 10.6.3. Since then I experienced complete system freezes (about once a day). Until recently, I was able to workaround this problem by installing the GPU kernel extensions from Mac OS X 10.6.2 on top of Mac OS X 10.6.3, later 10.6.4, 10.6.5, 10.6.6, and finally 10.6.7. This workaround does not work anymore, because installing the 10.6.2 kernel extensions on 10.6.8 causes kernel panics. See thread for more details, if you like.
My question: Is it somehow possible to replace that GPU of my iMac with some other?
Or is my only way out to leave OS X and switch to some other OS (Windows e.g. doesn’t show such problems)?
This looks like I could replace it with a GeForce 8800 GS:
But $549.95 seems crazy for such an old GPU …
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