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
G.SKILL Trident Z RGB Series (Intel XMP) DDR4 RAM 64GB (2x32GB) 3600MT/s CL18-22-22-42 1.35V Desktop Computer Memory UDIMM (F4-3600C18D-64GTZR) at Amazon.com
Corsair VENGEANCE LPX DDR4 64GB (2x32GB) 3200MHz CL16 Intel XMP 2.0 Computer Memory - Black (CMK64GX4M2E3200C16) at Amazon.com