Amazon.com: GDDR5 2GB Graphics Video Card Radeon HD 6970M for Apple iMac Mid-2011 27 Inch Core i5 i7 All-in-One Desktop PC Computer, AMD Radeon HD6970M HD6970 MXM Board GPU Upgrade Repair Parts :
Amazon.com: New 2 GB GDDR5 Graphics Video Card Replacement for Apple iMac A1312 Mid-2011 Core i7 3.4 MD063LL/A 27-Inch Desktop PC Computer AMD Radeon HD 6970M 2GB MXM VGA Board Upgrade Repair
Original HD 6970 HD6970M 2GB/1GB Video Card For Apple iMac 27" A1312 2011 Radeon HD 6970M 216-0811000 Graphic Card 109-C29657-10 - AliExpress
Asus Radeon HD 6970 2GB GDDR5 PCIe Reviews, Pros and Cons | TechSpot
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iMac 27' (mid 2011) fix for AMD Radeon HD 6970M no video problem - YouTube
661-5969 Video Card AMD Radeon HD 6970M 2GB for iMac 27" Mid 2011 A1312 | eBay