Memory Upgrades for 2019-2020 iMac 27-Inch - Up to 128GB
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
Amazon.com: Satechi Aluminum Type-C Clamp Hub Pro with USB-C Data Port, USB-A 3.0 Data, Micro/SD Card Reader - Compatible with 2020/2019/2017 iMac & iMac Pro, Does Not Fit 2021 iMac (Silver) :
Factory Original 64GB (2x32GB) Memory Upgrade for 2020 & 2019 Apple iMac 27" w/Retina 5K Display & 2018 Apple Mac Mini DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v RAM Adamanta at Amazon.com
OWC 16GB PC21300 DDR4 2666MHz SO-DIMM Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S16G)
How to Upgrade iMac Hard Drive or SSD 2012-2022: EveryMac.com
Can you upgrade the RAM in the 27-inch iMac? | iMore
2019 5K iMac RAM Upgrade Guide - YouTube
How to upgrade the RAM on the 27-Inch iMac (2020) | AppleInsider
How to upgrade the 27-inch 5K iMac (2019) with a massive 128GB of RAM [Video] - 9to5Mac
How to upgrade the 27-inch 5K iMac (2019) with a massive 128GB of RAM [Video] - 9to5Mac
Amazon.com: Apple iMac MRQY2LL/A 27 Inch Early 2019 i5 3.0GHz 8GB Ram - 1TB HHD (Renewed) : Electronics