Apple iMac 27 inch 16GB RAM Upgrade | 2020 Tutorial | TechCentury - YouTube
How to upgrade the RAM on the 27-Inch iMac (2020) | AppleInsider
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
iMac, 2021, 24-inch, Apple M1, 1TB SSD, 16GB RAM, Blue