This is a brand new, never used. It is unbranded memory made for Dell Servers by either Samsung, Hyniz, or Micron.

A9810564-MB, 

64GB (1x 64GB)

Quad Rank x4 

PC4-21300V-L (DDR4-2666) 

Load Reduced DIMM

CAS-19 

I purchased this brand new from a reputable server memory wholesaler, but I later discovered (after the return period had passed) that although my system is capable of 256GB of memory, my dual Xeon configuration is not. So, I have a total of four (4) 64GB DIMMs available.

https://www.serversupply.com/MEMORY/PC4-21300/64GB/DELL/A9810564_305073.htm 

Make sure to check compatibility using your own sources.