Adamanta 64GB (2x32GB) 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
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Can you upgrade the RAM in the 27-inch iMac? | iMore
Memory Upgrades for 2019-2020 iMac 27-Inch - Up to 128GB
27 inch iMac with Retina 5k Display 2019 3.7GHz i5 4TB SSD 128GB RAM | Refurbished | Techable
Amazon.com: A-Tech 128GB Kit (4x32GB) RAM for Apple iMac 2019 & 2020 27 inch Retina 5K | DDR4 2666 MHz SODIMM PC4-21300 / PC4-21333 260-Pin SO-DIMM Max Memory Upgrade : Electronics
OWC can double or quadruple the RAM in 27-inch iMac 5K | Cult of Mac
Apple iMac 5K 27-inch (Mid 2019) 3.6GHz i9 8GB RAM 2TB SSD - Buy Refurbished iMac 2019 at Techable
Amazon.com: Early 2019 Apple iMac with 3.0GHz Intel Core i5 (27 inch Retina 5K Display, 8GB RAM, 1TB) (Renewed)
How to upgrade the 27-inch 5K iMac (2019) with a massive 128GB of RAM [Video] - 9to5Mac