Hardware questions! Watching some tech reviews about the newest and bluest Dell Poweredge servers and I noticed in this link that NVDIMM's for the new Dell Poweredge 740XD servers require R-DIMM's to operate properly. Why can't NVRAM-N DIMM's simply operate independently on the board? (What's preventing Dell from supporting say 1 NVRAM-N DIMM per CPU Socket and nothing else? How are R-DIMM's that different beyond the backup capability?) Thanks!
Current operating system implementation of NVDIMM-Ns shows this memory as a block device (ie storage) where you typically mount a filesystem and use it as a regular (but really fast) disk.
See Dell EMC NVDIMM-N Persistent Memory, chapters 8 & 9.
So you still need RAM for the OS.