Apple announces new 27-inch iMac with lots of big upgrades, same price
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
Astra Gear 64GB(32GBx2) DDR4 2666MHz SO-DIMM Upgrade for 2020 & 2019 Apple iMac 27" w/Retina 5K Display iMac SO-DIMM Memory Module Ram Upgrade CL19 1.2V (AHA19ASDRAG8T-BG26SD) at Amazon.com
Apple iMac 5K 27-inch (Mid 2019) 3.6GHz i9 - Buy Refurbished iMac 2019 at Techable
Can you upgrade the RAM in the 27-inch iMac? | iMore
Install memory in an iMac - Apple Support
Apple iMac 2019 (Early) 27-inch (Retina 5k) OSX , Ram & SSD Upgrades - ZD Laptop Service Centre
The 27-inch iMac 2019's RAM may be upgraded to 128GB - NotebookCheck.net News
How to: 27-inch 5K iMac (2019) 128GB RAM Upgrade - Save $$$! - YouTube
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
Apple iMac (27-inch, 2019) | TechRadar
Memory Upgrades for 2019-2020 iMac 27-Inch - Up to 128GB