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parts-quick 8GB (2 X 4GB) Kit Memory Module for Apple iMac 27" 2017 5K Retina Display DDR4 2400MHz SO-DIMM RAM at Amazon.com
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DDR4 2400MHz PC4-19200 for Apple iMac 2017 27-inch w/Retina 5K iMac 18
8GB DDR4-2400MHz PC4-19200 SO-DIMM Memory for Apple 21.5" iMac with Retina 4K Display Mid 2020 by NEMIX RAM System Specific Memory - Newegg.com
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2019 iMac and DDR4 2400 memory | MacRumors Forums
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DDR4 2400MHz PC4-19200 for Apple iMac 21.5" 18,1 & 18,2
iMac 2017 RAM update, running smoothly on 3200MHz DDR4, higher than 2400MHz Recommendation : r/mac
