Amazon.com: 256GB DDR4-3200 PC4-25600 ECC Registered 8Rx4 Registered Server Memory by NEMIX RAM : Everything Else
256GB Kit (8 x 32GB) DDR4-3200 PC4-25600 ECC Registered Server Memory by NEMIX RAM at Amazon.com
Apple 128GB DDR4 LR-DIMM ECC Memory Module Kit (2 x 64GB)
A-Tech 256GB (8 x 32GB) Kit for HP Z820 Workstation Compatible DDR3 1866MHz PC3-14900 4rx4 ECC Load Reduced LRDIMM 1.5v Server Memory RAM Sticks (ATMS37187134227X8) at Amazon.com
Samsung Shows Off 256 GB DDR4 RDIMM: Coming to Servers Soon
G.Skill Trident Z NEO Series 256GB (8 x 32GB) 288-Pin SDRAM PC4-28800 DDR4 3600 CL18-22-22-42 1.35V Quad Channel Desktop Memory Model F4-3600C18Q2-256GTZN at Amazon.com