Apple Initiates Video Card Replacement Program for Radeon HD 6970M Equipped Mid-2011 27” iMacs
Original For Apple Imac 27" A1312 Vga Card Gpu 216-0732019 Video Card Graphic Card 109-b90957-00 Hd4850 512mb Full Tested - Pc Hardware Cables & Adapters - AliExpress
Amazon.com: 2 GB Graphics Video Card GPU Upgrade Replacement for Apple iMac Mid-2011 A1312 27 Inch Core i7 3.4 i5 3.1 Desktop Computer, New AMD Radeon HD 6970M HD6970M 2GB MXM Board
Amazon.com: Valley Of The Sun Graphics Video Card GPU Replacement for Apple iMac Mid-2010 A1311 Core i3 3.06 MC508LL/A MC508 21.5 Inch Desktop Computer, ATI Radeon HD 4670 GDDR3 256MB, MXM VGA
Upgrading an iMac GPU for METAL Support! Late 2009 – Mid 2011 Models - YouTube
iMac Graphics Card GPU Overheating and Failure
Refurbished 24-inch iMac Apple M1 Chip with 8‑Core CPU and 8‑Core GPU, Gigabit Ethernet - Yellow - Apple
iMac Intel 27" EMC 2374, AMD Radeon HD 4850 Video Card Removal & Repair - iFixit Repair Guide