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Amazon.com: Original Graphics Video Card for Apple iMac 2011 Core i5 2.7 A1312 MC813LL/A MC813 27 Inch Desktop PC Computer AMD Radeon HD 6770M HD6770M GDDR5 512MB 109-C29557-00 Replacement Parts : Electronics
SOLVED: AMD Radeon HD 6770M on iMac can be replaced by AMD radeon 6970 - iMac Intel 27" EMC 2429 - iFixit
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