Adamanta 16GB (1x16GB) Memory Upgrade for 2020 Apple iMac 27" w/Retina 5K Display, 2019 Apple iMac 27" w/Retina 5K Display, 2018 Apple Mac Mini DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v DRAM
Install memory in an iMac - Apple Support
How to upgrade iMac (2020) RAM and save up to $2000 - 9to5Mac
CMS 32GB (4X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core I5 3.2 27-Inch (Late 2013) Me088Ll/A - A6 at Amazon.com
Apple 27" iMac® with Retina 5K display Intel Core i5 (3.1GHz) 8GB Memory 256GB SSD Silver MXWT2LL/A - Best Buy
Can you upgrade the RAM in the 27-inch iMac? | iMore