Amazon.com: Original 2GB Graphics Video Card Upgrade Replacement for Apple iMac Mid-2011 27 Inch A1312 Core i7 3.4 MD063LL/A MD063 Desktop PC Computer, AMD ATI Radeon HD 6970 Spare Parts Full Tested :
iMac Repair & Upgrade, Same Day Services
Baking a Graphics Card | macman860
Upgrading the GPU in the 2011 iMac - is it worth it? - YouTube
Burn the VGA and Fix your iMac - Don't Pay Shitty Problems!!! - YouTube
Apple iMac Videokaart Reparatie Vervangen - MobileHardware
Apple Initiates Video Card Replacement Program for Radeon HD 6970M Equipped Mid-2011 27” iMacs
Amazon.com: Original Graphics Video Card for Apple iMac 2011 Core i5 2.7 A1312 MC813LL/A MC813 27 Inch Desktop PC Computer AMD Radeon HD 6770M HD6770M GDDR5 512MB 109-C29557-00 Replacement Parts : Electronics
Late 2009 iMac 27" Video Card Repair — 4850 — 2nd Bake - YouTube