NEMIX RAM 32GB Upgrade Kit (2x16GB) DDR4 2666MHz PC4-21300 SODIMM Memory Compatible for Apple iMac Mid 2020 iMac (20,1 / 20,2) / Mid 2019 iMac (19,1) 27-inch w/Retina 5K, Late 2018 Mac Mini (8,1) at Amazon.com
How To Upgrade RAM in a Mac | Macworld
Install and replace memory in your Mac Pro (2019) - Apple Support
64GB 2x32GB DDR4-2933Mhz PC4-23400 288-Pin RDIMM Memory for Apple Mac Pro 2019 7,1 by NEMIX RAM at Amazon.com
Timetec Hynix IC - Scheda di memoria RAM compatibile con Apple 2019 iMac 27" w/Retina 5K, fine 2018 Mac Mini DDR4 2666MHz PC4-21300 2Rx8 CL19 1.2V SODIMM 32GB KIT(4x8GB) : Amazon.it: Informatica
Mac Store UK Build your own Mac Pro (7.1) 2019 | Mac Store UK
Why the Mac Pro lacks upgradable RAM and support for eGPUs
A-Tech 16GB Kit (2 x 8GB) Memory Ram for 2019 Apple iMac 27 inch Retina 5K (iMac19,1 A2115), 2018 Apple Mac Mini (Macmini8,1 A1993) DDR4 2666MHz PC4-21300 SODIMM : Amazon.co.uk: Computers & Accessories
You may be able to save thousands of dollars on upgrading Mac Pro RAM - 9to5Mac