128GB (4x32GB) DDR4-2666MHz PC4-21300 ECC RDIMM 2Rx4 1.2V Registered Memory for Server by NEMIX RAM at Amazon.com
Unbuffered, registered, buffered and fully buffered RAM - YouTube
16 x 64GB PC4-17000 2133MHz | DDR4 RAM | Aventis Systems
64GB (2x32GB) DDR5 4800MHz Server RAM Module | Integral
CMS 32GB (4x8GB) DDR3 10600 1333MHZ ECC Registered DIMM Memory Ram Upgrade Compatible with IBM® System x3400 M3 7378, 7379 DDR3-PC1333 for Server Only - B103 at Amazon.com