iMac 27" A1312 Mid 2011 Video Card AMD Radeon HD 6770M 512MB 730-0630-A 661-5967 | eBay
iMac 2009 / 2010 / 2011 GPU upgrade — Fixing LED/LCD PWM brightness with an ESP32 | by Fixing Things | Medium
2011 iMac GPU Upgrade Now with Brightness and Boot menu - Absolutely Worth It! - YouTube
Imac Mid 2011 GPU Fix | MacRumors Forums
Amazon.com: Valley Of The Sun New 2GB Graphics Video Card Upgrade for Apple iMac Mid-2011 27 Inch Core i5 MC814LL/A MC814 A1312 Desktop All-in-One PC, AMD Mobility Radeon HD 6970M Replacement :
Upgrading an iMac GPU for METAL Support! Late 2009 – Mid 2011 Models - YouTube
SOLVED: What GPU's are compatible with iMac 27" 2011? - iMac Intel 27" EMC 2429 - iFixit
Amazon.com: Original Graphics Video Card GPU Upgrade Replacement for Apple iMac 21.5 Inch Late 2011 Core i3 3.1 All-in-One Desktop PC MC978LL/A, AMD ATI Mobility Radeon HD 6750M GDDR5 512MB MXM Board :
Apple 730-0628-A iMac 27" A1312 Mid 2011 Graphics Card Heatsink with Sensor | Heatsinks | Team Spares
Amazon.com: Valley Of The Sun New 2GB Graphics Video Card Upgrade for Apple iMac Mid-2011 27 Inch Core i5 MC814LL/A MC814 A1312 Desktop All-in-One PC, AMD Mobility Radeon HD 6970M Replacement :
Upgrading the graphics in our 2011 iMac (first attempt) - YouTube