16GB (1x16GB) DDR4-2666MHz PC4-21300 Non-ECC UDIMM 2Rx8 1.2V Unbuffered Memory for Desktop PC by NEMIX RAM at Amazon.com
PNY Performance 16GB DDR4 DRAM 2666MHz (PC4-21300) CL19 (Compatible with 2400MHz or 2133MHz) 1.2V Notebook/Laptop (SODIMM) Computer Memory RAM – MN16GSD42666 at Amazon.com
Crucial 16GB Single DDR4 2666 MT/s (PC4-21300) DR X8 SODIMM 260-Pin Memory - CT16G4SFD8266 at Amazon.com
Corsair LPX 16GB DDR4 DRAM 2666MHz C16 Memory Kit CMK16GX4M1A2666C16 Black at Amazon.com
Factory Original 64GB (2x32GB) Memory Upgrade for 2020 & 2019 Apple iMac 27" w/Retina 5K Display & 2018 Apple Mac Mini DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v RAM Adamanta at Amazon.com