G.Skill Trident Z RGB Series 64GB (2 x 32GB) 288-Pin SDRAM (PC4-28800) DDR4 3600 CL18-22-22-42 1.35V Dual Channel Desktop Memory Model F4-3600C18D-64GTZR at Amazon.com
KTH-PL432/64G - 64GB RDIMM DDR4 3200Mhz 1.2V 2Rx4 Memory for HP Servers (Equiv. HP: P07650-B21) at Amazon.com
Lenovo 64GB DDR4 3200MHz ECC RDIMM Memory | Lenovo US
Hewlett Packard Enterprise HPE SmartMemory 64GB DDR4 SDRAM Memory Module - for Server - 64 GB (1 x 64 GB) - DDR4-2933/PC4-2346 at Amazon.com