iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen
memory - What can be replaced/upgraded in a late-2009 iMac to make it run like a 2014-2016 iMac? - Ask Different
iMac Late 2009 21.5" GPU upgrade - Apple Community
AMD Radeon HD 4850 | Late 2009 iMac stock video card | James Wages | Flickr
iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen
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