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Amazon.com: 2GB Graphics Card GPU Upgrade Replacement, for Apple iMac 27" 2011 Desktop Computer A1312 Core i7 3.4 MD063LL/A MD063, AMD Radeon HD 6970M GDDR5 2 GBs, MXM VGA Video Board Repair
2011 iMac 27″ GPU failure Fix/Upgrade – JCYCLE
For iMac 27" A1312 Mid 2009 2011 HD6970M upgrade NVIDIA GTX 765M 2GB Video Card | eBay
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
Upgrading an iMac GPU for METAL Support! Late 2009 – Mid 2011 Models - YouTube
APPLE iMac 27" A1312 109-C29657-10 HD 6970M 1GB GPU VIDEO CARD 2011 FOR REPAIR - Mo & Joe Electronics
Helping a friend fix up his mid 2011 iMac 27 inch, it seems to have a few problems : r/mac
For iMac 27" A1312 Mid 2009 2010 2011 upgrade NVIDIA K4100M 4GB GPU Video Card | eBay
iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen