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memory - What can be replaced/upgraded in a late-2009 iMac to make it run like a 2014-2016 iMac? - Ask Different
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iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen
5 Things to Know Before Upgrading Your 2009 or Later iMac
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iMac 21.5" 2010 - GPU Replacement - Not booting | MacRumors Forums
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iMac 21.5" Late 2009 (10,1) - CPU Upgrade E8600 | MacRumors Forums
iMac Intel 21.5" EMC 2428 Radeon HD 6750M Graphics Card
For Apple iMac 21.5" A1311 Mid/Late 2009 2010 2011 NVIDIA K2100M 2GB Video Card | eBay
iMac Late 2009 21.5" GPU upgrade - Apple Community
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
