Adamanta 64GB (2x32GB) Memory Upgrade for 2019 & 2020 Apple iMac 27" (iMac 19,1 iMac 20,1 iMac 20,2) Retina 5K Display, 2018 Mac Mini DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v DRAM RAM : Amazon.ca: Electronics
How To Upgrade RAM in a Mac | Macworld
Memory Upgrades for 2019-2020 iMac 27-Inch - Up to 128GB
How to upgrade the 27-inch 5K iMac (2019) with a massive 128GB of RAM [Video] - 9to5Mac
Timetec 32GB KIT(4x8GB) Compatible for Apple DDR4 2666MHz for Mid 2020 iMac (20,1 / 20,2) / Mid 2019 iMac (19,1) 27-inch w/Retina 5K Display PC4-21333 / PC4-21300 CL19 SODIMM Memory MAC RAM Upgrade at Amazon.com
NEMIX RAM Compatible for 128GB (4x32GB) DDR4 2666MHz PC4-21300 SODIMM Memory Upgrade for Apple iMac Mid 2020 (iMac 20,1/20,2) / Mid 2019 (iMac19,1) 27-inch w/Retina 5K, Late 2018 Mac Mini 8,1 at Amazon.com
Third-Party RAM for 27-inch iMac Still Far More Affordable Than Apple's Checkout Upgrade Options - MacRumors
Factory Original 128GB (4x32GB) Memory Upgrade for 2020 & 2019 Apple iMac 27" w/Retina 5K Display DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v RAM Adamanta at Amazon.com