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NEMIX RAM Compatible for 16GB (2X8GB) DDR4 2400MHz PC4-19200 SODIMM Memory Upgrade for Apple iMac 2017 27-inch w/Retina 5K, 21.5-inch w/Retina 4K / Non-Retina 4K) iMac 18,1 / iMac 18,2 / iMac 18,3 - Newegg.com
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Review: Apple's 21.5" iMac with Retina 4K display gets solid 2017 architectural refresh | AppleInsider
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