Dell M393A2K43CB2-CVF-RFB is a refurbished memory module for server memory upgrades. The exact listing identifies it as a 16GB 2Rx8 PC4-23400Y-R DDR4-2933MHz module.
It uses the DDR4 RDIMM format and has a 2933 MT/s speed rating. Its dual-rank x8 organization, 1.2 V operating voltage and 288-pin design are specified for the matching Samsung base module M393A2K43CB2-CVF.
The listing identifies this item as refurbished and used. The registered DIMM format makes it a server memory component; the cited sources do not specify compatible server models.