iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
How to Improve Multitasking with an iMac Ram Upgrade?
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 do you install RAM in your iMac? - Coolblue - anything for a smile
Memory Upgrades for 2019-2020 iMac 27-Inch - Up to 128GB
Apple's 4K 21.5-Inch iMac Allows You to Upgrade RAM and CPU – Company Finally Dialing Down on Soldered Components, Reveals Teardown