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iMac "Core i5" 3.3 27" (5K, Mid-2015) Specs (Retina 5K, Mid-2015, MF885LL/A, iMac15,1, A1419, 2806): EveryMac.com
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4GB PC3-12800 RAM for Apple iMac Mid 2015 - 27 Inch Retina 5K MF885LL/A - MF885xx/A Memory Upgrade Module
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How to upgrade the memory of a 27-inch iMac with Retina 5K display (Late 2014 - Mid 2015) iMac15,1 - YouTube
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