How to Install Memory iMac 27-inch 5K (RAM Crucial 16GB) - YouTube
Amazon.com: OWC 32GB (2 x 16GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S32P) : Everything Else
Apple iMac 27 inch 16GB RAM Upgrade | 2020 Tutorial | TechCentury - YouTube
How to Upgrade the Memory in the iMac Pro (late 2017) - YouTube
Install memory in an iMac - Apple Support
Base model iMac Pro teardown sheds more light on its upgrade potential - 9to5Mac
Install memory in an iMac - Apple Support
Teardown of New 4K 21.5-inch iMac Reveals Removable RAM and Modular CPU - MacRumors