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-Apple part #661-4990. Yes it can be swapped out.
+Apple part #661-4990. Yes it can be swapped out. Here's the guide: http://www.ifixit.com/Guide/Repalcing+iMac+Intel+24-Inch+EMC+2267+Graphics+Card/13765/1

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open

crwdns2893792:0crwdne2893792:0 mayer ,

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Apple part #661-4990.  Yes it can be swapped out.

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open