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 :
Source Original Radeon HD 6970M 2GB GDDR5 Graphics Card for iMac A1312 HD6970 109-C29647-00 Graphic Card Video Card on m.alibaba.com
Apple+iMac+27%22+Mid+2010+AMD+Radeon+HD+A1312+VGA+Video+Card+Heatsink+6970m+6970 for sale online | eBay
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
NEW For Apple iMac 27" A1312 2011 AMD Radeon HD 6970M 2GB GDDR5 VGA Video Card | eBay
Source Original Radeon HD 6970M 2GB GDDR5 Graphics Card for iMac A1312 HD6970 109-C29647-00 Graphic Card Video Card on m.alibaba.com
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 :
AMD Radeon HD 6970M 1GB Video Graphics Card Apple iMac A1312 27" Mid 2011 TESTED - eSocket.us
SVC-APL-661-5968 Apple Radeon HD 6970M 1GB Video Graphics Card for iMa
iMac 27' (mid 2011) fix for AMD Radeon HD 6970M no video problem - YouTube
AMD Radeon HD 6970M Mac Edition Specs | TechPowerUp GPU Database