Late 2009 iMac 27" Video Card Repair [4850 Bake] - YouTube
Apple iMac 21.5" 2010 ATI HD 4670 256MB GDDR3 GPU Screws Brackets & Airport Card | eBay
Upgrading an iMac GPU for METAL Support! Late 2009 – Mid 2011 Models - YouTube
Amazon.com: Valley Of The Sun Genuine Graphics Video Card Replacement for Apple iMac Mid-2010 Core i5 A1312 27-Inch MC511LL/A MC511 Desktop PC, ATI Mobility Radeon HD 5750 GDDR5 1GB MXM VGA 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