64GB (4x16GB) DDR4-2666MHz PC4-21300 Non-ECC UDIMM 2Rx8 1.2V Unbuffered Memory for Desktop PC by NEMIX RAM at Amazon.com
OWC 64GB (2 x 32GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, Dell, HP, Lenovo, ASUS and Compatible PCs (OWC2666DDR4S64P) at Amazon.com
CMS 64GB (4X16GB) DDR4 21300 2666MHz Non ECC DIMM Memory Ram Upgrade Replacement for ASRock® Motherboard B550 Steel L Legend, B550 T Taichi, B550 Taichi Razer Edition, B550M PG Riptide - D56 -