Amazon.com: Valley Of The Sun Genuine Graphics Card GPU Replacement for AMD Radeon HD 6970M GDDR5 1GB 109-C29657-10 for Apple iMac 2011 27" MC814LL/A MD063LL/A A1312 Desktop PC Computer, MXM Video Board :
Genuine 2GB Graphics Video Card Replacement for Apple iMac 2011 A1312 i7 3.4 MD063LL/A MD063 27-Inch Desktop PC Computer AMD Radeon HD 6970M GDDR5 2 GB Upgrade MXM VGA Board 109-C29657-10 Repair
NEW Apple iMac 27" A1312 mid 2011 AMD Radeon HD 6970M 2GB DDR5 VGA Video Card | eBay