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
64GB DDR3 SDRAM Memory Module at Amazon.com
64GB (2x32GB) DDR3-1600MHz PC3-12800 ECC LRDIMM 4Rx4 1.5V Load Reduced Server Memory by NEMIX RAM at Amazon.com
MemoryMasters 64GB (16x4GB) DDR3-1600MHz PC3-12800 ECC RDIMM 1Rx4 1.35V Registered Memory for Server/Workstation at Amazon.com
64GB (8x8GB) DDR3-1600MHz PC3-12800 ECC UDIMM 2Rx8 1.35V Unbuffered Server Memory by NEMIX RAM at Amazon.com