128GB Kit (4 x 32GB) PC4-21300 RAM for Apple iMac 2019 - 27 Inch Retina 5K
Install memory in an iMac - Apple Support
How to upgrade the 27-inch 5K iMac (2019) with a massive 128GB of RAM [Video] - 9to5Mac
Adamanta 64GB (2x32GB) Memory Upgrade for 2020 Apple iMac 27" w/Retina 5K Display, 2019 Apple iMac 27" w/Retina 5K Display, 2018 Apple Mac Mini DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v DRAM
OWC can double or quadruple the RAM in 27-inch iMac 5K | Cult of Mac
2019 5K iMac RAM Upgrade Guide - YouTube
Install memory in an iMac - Apple Support
Apple iMac 27 Inch 5K 2019 3.7 GHz 6-Core i5 1 TB SSD 32GB RAM 580X 8GB GFX | MacPro-LA
Can you upgrade the RAM in the 27-inch iMac? | iMore