SOLVED: AMD Radeon HD 6770M on iMac can be replaced by AMD radeon 6970 - iMac Intel 27" EMC 2429 - iFixit
iMac 21.5" AMD Radeon HD 6770M, 512MB (11) 661-5945
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APPLE IMAC 27" A1312 2011 4GB Graphics Card - Replacement for AMD Radeon HD 6770 EUR 277,40 - PicClick IT
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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
iMac 21,5" Core i5 Quadricoeur 2,7 GHz 4 Go 1 To Radeon HD 6770M Thunderbolt - iMac - Apple