A lot of this was Intel’s own misbegotten attempt to force the use of higher profit processor SKUs which were the only ones allowing enough memory slots/address

A lot of this was Intel’s own misbegotten attempt to force the use of higher profit processor SKUs which were the only ones allowing enough memory slots/address space to be useful. Also the Optane interface is incredibly complex with lots of funny tradeoffs having more to do with imposed market segmentation than technology. I can’t comment on 3DXP cost effectiveness but it was always funny how Intel ducked admitting the use of Ovshinsky IP.