A-Tech 16GB (2x8GB) RAM for Apple iMac Late 2015 27 inch Retina 5K | DDR3L
The New 2017 iMac: Notes & Tidbits on RAM - The Mac Observer
How To Upgrade RAM in a Mac | Macworld
Install memory in an iMac - Apple Support
Upgrade your iMac 27'' 2017 RAM with MrMemory review - Wim Arys
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
How to upgrade the 27-inch 5K iMac (2019) with a massive 128GB of RAM [Video] - 9to5Mac
How to upgrade iMac (2020) RAM and save up to $2000 - 9to5Mac