Amazon.com: Valley Of The Sun 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 Repair Parts :
iMac Intel 27" EMC 2374, AMD Radeon HD 4850 Video Card Removal & Repair - iFixit Repair Guide
2020 ($1,800) 5K iMac — Will an eGPU improve performance? [Video] - 9to5Mac
Need to repair this iMac 27" 2011, Please any suggestions? GPU Temperature is not even 50 C : r/mac
Burn the VGA and Fix your iMac - Don't Pay Shitty Problems!!! - YouTube
Upgrading the graphics in our 2011 iMac (first attempt) - YouTube
How to Upgrade/Replace GPU Graphics Card on Mid-2011 21.5" iMac - YouTube