2019 iMac review: The best of a bygone era – Six Colors
Upgrade RAM on 2019 21.5" iMac - worth it or not? | MacRumors Forums
How to upgrade the 27-inch 5K iMac (2019) with a massive 128GB of RAM [Video] - 9to5Mac
64GB RAM upgrade kit for 21.5-inch iMAC now offered by OWC - 9to5Mac
How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
OWC 16GB (2 x 8GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S16P) at Amazon.com
How to Upgrade/Replace the Memory in a 21.5-inch iMac (2019)