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Amazon.com: Sunvalley 2GB Graphics Video Card Replacement for Apple iMac Mid -2011 27 Inch A1312 Core i7 3.4 MD063LL/A MD063 Desktop PC Computer, ATI Radeon HD 6970 GDDR5 2 GB, New GPU Upgrade
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Amazon.com: Sunvalley 2GB Graphics Video Card Replacement for Apple iMac Mid -2011 27 Inch A1312 Core i7 3.4 MD063LL/A MD063 Desktop PC Computer, ATI Radeon HD 6970 GDDR5 2 GB, New GPU Upgrade
iMac Intel 27" EMC 2429 Radeon HD 6770M Graphics Card
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Amazon.com: Graphics Video Card for Apple iMac Mid-2011 A1312 Core i5 2.7 27 -Inch Desktop PC MC813LL/A, AMD Radeon HD 6770M GDDR5 512MB 109-C29557-00, MXM VGA Board Genuine Replacement Parts : Electronics