64GB 2X 32G DDR4 2666 PC4-21300 ECC REG DIMM for HP Z6 G4 Workstation Memory RAM | eBay
Amazon.com: G.Skill Trident Z Royal 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-64GTRS : Electronics