Don't Upgrade The RAM In Your New Apple iMac, Do This Instead
Install memory in an iMac - Apple Support
The New 2017 iMac: Notes & Tidbits on RAM - The Mac Observer
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz SODIMM PC3-12800 204-Pin SO-DIMM Max Memory Upgrade at Amazon.com
Can you upgrade the RAM in the 27-inch iMac? | iMore
2019 5K iMac RAM Upgrade Guide - YouTube
How to upgrade iMac (2020) RAM and save up to $2000 - 9to5Mac