Late 2009 iMac 27" Video Card Repair — 4850 — 2nd Bake - YouTube
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Baking a Graphics Card | macman860
Apple iMac A1312 27" AMD Radeon HD 6970M 1GB Video Card w Heatsink 109-C29657-10 | eBay
Amazon.com: Graphics Video Card GPU Replacement for Apple iMac Mid-2010 A1311 Core i3 3.06 MC508LL/A MC508 21.5 Inch Desktop Computer, ATI Radeon HD 4670 GDDR3 256MB, MXM VGA Board Repair Parts : Electronics