Cisco UCS 64GB DDR4-2666-MHz TSV-RDIMM//4R/x4 UCS-MR-X64G4RS-H at Amazon.com
Timetec 64GB KIT(4x16GB) DDR4 3600MHz PC4-28800 CL18 1.35V Non-ECC Unbuffered Designed for Gaming and Graphic Compatible with AMD and Intel Desktop PC Computer Memory Module Upgrade (64GB KIT(4x16GB)) at Amazon.com
HP SmartMemory 64GB DDR4 SDRAM Memory Module at Amazon.com
256GB Kit (4 x 64GB) DDR4-3200 PC4-25600 ECC Load Reduced Memory for ASRock Rack EPYCD8-2T Board by NEMIX RAM at Amazon.com