How to upgrade the RAM on the 27-Inch iMac (2020) | AppleInsider
How to upgrade iMac (2020) RAM and save up to $2000 - 9to5Mac
OWC 64GB (4 x 16GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S64S) at Amazon.com
hardware - Installing 2 x 16Gb and 2 x 32Gb on an iMac 27" - Ask Different
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET