Axiom 64GB DDR4-2400 ECC LRDIMM - AX42400L17C/64G at Amazon.com
64GB Kit (2 x 32GB) DDR4-2933 PC4-23400 Non-ECC Unbuffered Desktop Memory by NEMIX RAM 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