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 :
HD 6970M HD6970 HD6970m 2GB VGA card Apple iMac 27 "a mediados de 2011 Radeon A1312 109-C29657-10 100%Test ok - Newegg.ca
AMD Radeon HD 6970M HD6970M 2GB DDR5 MXM Graphics Video Card for Apple iMac 2011 | eBay