Amazon.com: Valley Of The Sun 2GB Graphics Video Card Upgrade for Apple iMac Mid-2011 27 Inch Core i5 MC814LL/A MC814 A1312 Desktop All-in-One PC, AMD Mobility Radeon HD 6970M Replacement Repair Parts :
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Amazon.com: 2GB Graphics Card GPU Upgrade Replacement, for Apple iMac 27" 2011 Desktop Computer A1312 Core i7 3.4 MD063LL/A MD063, AMD Radeon HD 6970M GDDR5 2 GBs, MXM VGA Video Board Repair