iMac Intel 21.5" EMC 2389 Radeon HD 4670 Graphics Card
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 Board :
iMac 2010 GPU in 2011 | MacRumors Forums
Intel iMac 21.5" ATI Radeon HD 4670 256MB Video Card, Mid 2010
For iMac 27" A1312 Mid 2010 2011 upgrade Nvidia Quadro K3000M 2GB GPU Video Card | eBay
How to Upgrade/Replace GPU Graphics Card on Mid-2011 21.5" iMac - YouTube
For iMac 27" A1312 Mid 2009 2011 HD6970M upgrade NVIDIA GTX 765M 2GB Video Card | eBay
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
Nvidia Quadro K1000m 2gb Mxm Video Card Preflashed Vbios For Imac 21.5" / 27" Late 2009 To Mid 2011 Upgrade - Laptop Repair Components - AliExpress
Mid-2010 iMac GPU Upgrade - New Builds and Planning - Linus Tech Tips
Original Ati HD 6970M 5750m 4850 4670 Graphics Card Video Card 1GB 2GB 109-C29657-10 For Apple iMac 27" A1312 GPU 2009 2010 2011 - AliExpress
Intel iMac 21.5" ATI Radeon HD 5670 512MB Video Card DIY Parts replacement Video Cards
Bought a mid 2010 iMac at goodwill for 15$. It works technically.... : r/mac