Custom Build 2021 Apple iMac 24-inch M1 8-Core CPU, 8-Core GPU (4.5K R – Mac Shack
iMac (2007-2009) Memory Installation Video - YouTube
Timetec 64GB KIT(2x32GB) Compatible for Apple DDR4 2666MHz for Mid 2020 iMac (20,1 / 20,2) / Mid 2019 iMac (19,1) 27-inch w/Retina 5K Display, Late 2018 Mac Mini (8,1) PC4-21333 / PC4-21300 MAC RAM at Amazon.com