Memory Upgrades for iMac w/ Retina 5K Display Late 2015
Timetec Hynix IC 16GB Compatible for Apple 2019 iMac 27-inch w/Retina 5K Display, Late 2018 Mac Mini DDR4 2666MHz PC4-21300 2Rx8 CL19 1.2V SODIMM Memory RAM Upgrade (16GB) - Newegg.com
OWC 16GB (2 x 8GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with 27" iMac w/
iMac (Retina 5K, 27-inch 2020) RAM Upgrade - Ask Different