How do I update a graphics card?
ATI Radeon HD4670
OS 10.8.4
iMac, OS X Mountain Lion (10.8.4)
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You don't.
The graphics processing chip IS NOT a user upgradeable component and if you have a recent Mac ,2011 of newer with AppleCare or extended AppleCare, you will void the warranty plus void any future repairs and replacement work from Apple, if you even open the case to try an attempt this yourself.