SOLVED: AMD Radeon HD 6770M on iMac can be replaced by AMD radeon 6970 - iMac Intel 27" EMC 2429 - iFixit
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Amazon.com: Valley Of The Sun Original Graphics Video Card GPU Replacement for HP EliteBook 8540W 8560W 8560P 8570W Mobile Workstation Laptop, AMD Radeon HD 6770M GDDR5 1GB, MXM VGA Board Repair Parts :
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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
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