Amazon.com: Valley Of The Sun 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,
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
How to upgrade a Mac: Swap in new RAM, graphics card, hard drive and more | Macworld
M4000 Video Graphic Card | Graphic Video Card Imac | Amd Imac Graphics Card - Laptop Repair Components - Aliexpress
2011 iMac Graphics Card Upgrade | How to | Mac Expert Guide
Amazon.com: Valley Of The Sun 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