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 :
661-5968 Apple Video Card AMD Radeon HD 6970M 1GB for iMac 27" Mid 2011 A1312 Refurbished
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
Apple Initiates Video Card Replacement Program for Radeon HD 6970M Equipped Mid-2011 27” iMacs