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Apple iMac 27" A1312 Mid 2011 - Video Card AMD Radeon HD 6770M 512MB 661-5967 | Part Haven | Reviews on Judge.me
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655488-001 659095-001 For HP Pavilion DV7-6000 DV7T-6000 Laptop Motherboard HM65 HD 6770M/6770M GPU DDR3 100% Fully Tested - AliExpress
SOLVED: AMD Radeon HD 6770M on iMac can be replaced by AMD radeon 6970 - iMac Intel 27" EMC 2429 - iFixit
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