iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Upgrade your iMac 27'' 2017 RAM with MrMemory review - Wim Arys
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
How to upgrade the RAM on the 27-Inch iMac (2020) | AppleInsider
The New 2017 iMac: Notes & Tidbits on RAM - The Mac Observer