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Apple Initiates Video Card Replacement Program for Radeon HD 6970M Equipped Mid-2011 27” iMacs
Amazon.com: New 2 GB GDDR5 Graphics Video Card Replacement for Apple iMac A1312 Mid-2011 Core i7 3.4 MD063LL/A 27-Inch Desktop PC Computer AMD Radeon HD 6970M 2GB MXM VGA Board Upgrade Repair
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iMac Intel 27" EMC 2429 Radeon HD 6970M Graphics Card
iMac Intel 21.5" EMC 2428 Radeon HD 6750 Graphics Card