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

10-11  Source: Network gathering  Views:0 

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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 https://discussions.apple.com/message/15486107 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: http://www.welovemacs.com/apim242inco230.html
But $549.95 seems crazy for such an old GPU …
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