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iMac Intel 27" (Late 2009 or Mid 2010) Graphics Card Replacement - iFixit Repair Guide
iMac 2010 GPU in 2011 | MacRumors Forums
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2011 iMac Graphics Card Upgrade | MacRumors Forums
iMac Intel 27" EMC 2374, AMD Radeon HD 4850 Video Card Removal & Repair - iFixit Repair Guide
