AMD Radeon HD 6970M HD6970M 2GB DDR5 MXM Graphics Video Card for Apple iMac 2011 | eBay
AMD Radeon HD 6970 Specs | TechPowerUp GPU Database
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
661-5969 Apple Radeon HD 6970M 2GB Video Graphics Card for iMac (27-inch Mid 2011)
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 :