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2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider
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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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Amazon.com: Late-2015 Apple iMac 21.5 with 4K Retina Display/3.1GHz Intel Core i5-5675R Quad-Core (21.5-inch, 8GB RAM, 1TB) (Renewed) : Electronics
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