Amazon.com: 2GB Graphics Video Card Replacement for Apple iMac Mid-2011 27 Inch A1312 Core i7 3.4 MD063LL/A MD063 Desktop PC Computer, ATI Radeon HD 6970 GDDR5 2 GB, New GPU Upgrade Repair
Late 2009 iMac 27" Video Card Repair — 4850 — 2nd Bake - YouTube
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iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen
iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen
For iMac 27" A1312 Mid 2009 2010 2011 6970M upgrade NVIDIA GTX 860M Video Card | eBay
Someone gave me this unwanted Mac, anyone know if you can upgrade the graphics cards on these ? Keep seeing conflicting information it's a 24" early 2009 imac : r/mac
iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen