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Apple opens graphics card replacement program for some mid-2011 iMacs - 9to5Mac
iMac Intel 27" EMC 2374, AMD Radeon HD 4850 Video Card Removal & Repair - iFixit Repair Guide
Apple IMAC 27” A1312 Nvidia Quadro K5000M 4GB MXM Video Card GPU Replace 6970M | eBay
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Upgrading the graphics in our 2011 iMac (first attempt) - YouTube
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Late 2009 iMac 27" Video Card Repair [4850 Bake] - YouTube
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How to Upgrade/Replace GPU Graphics Card on Mid-2011 21.5" iMac - YouTube
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