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OWC 32GB (4 x 8GB) 2666MHz DDR4 PC4-21300 SO-DIMM 260 Pin Memory Upgrade, (OWC2666DDR4S32S), for 2019 27 inch iMac (iMac19,1)
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OWC 32GB (2 x 16GB) 2400MHZ DDR4 SO-DIMM PC4-19200 Memory Upgrade For 2017 iMac 27 inch with Retina 5K display - Newegg.com
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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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