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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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Adamanta 16GB (1x16GB) Memory Upgrade for 2017 Apple iMac 27" Retina 5K Display DDR4 2400Mhz PC4-19200 SODIMM 2Rx8 CL17 1.2v Dual Rank RAM DRAM - Walmart.com
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Apple iMac 27-inch with Retina 5K display (2017): CPU and GPU upgrades deliver better value for money | ZDNet
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