Amazon.com: Original Graphics Video Card GPU Upgrade Replacement for Apple iMac 21.5 Inch Late 2011 Core i3 3.1 All-in-One Desktop PC MC978LL/A, AMD ATI Mobility Radeon HD 6750M, MXM VGA Board Repair
Amazon.com: Valley Of The Sun Original Graphics Video Card GPU Replacement for Apple iMac A1311 Mid-2011 Core i5 2.7 MC812LL/A MC812 21.5 Inch Desktop Computer, AMD Radeon HD 6770M GDDR5 512MB Repair
Video Graphics Card AMD Radeon HD 6750M 512MB 109-C29557-00 Apple A1311 iMac » eRecycler Online
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Videoboard ATI Radeon HD 6750M 109-c29557-00 512MB iMac A1311 A1312 - used original spareparts for Macs