Brand New HD6970 HD6970M HD 6970M 2GB Video Card For Apple iMac 27" A1312 A1311 2011 216-0811000 Graphic Card 109-C29647-00 - AliExpress
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 :