While Intel/Micron have made quite a splash with their 3D XPoint non-volatile memory (NVM) they are not alone in bringing new NVM tech to market. Everspin is ramping MRAM, which has critical advantages over 3D XPoint.
IBM used MRAM in their Open Power summit demo of Storage Class Memory. Today it is most used where you can't see it, as a fast NVM buffer in controllers and other embedded applications.
Why MRAM hasn't killed DRAM
A couple of reasons. The technology is still maturing - DRAM is 50 years old, while flash is 30 years old - so cost per bit is much higher than DRAM.
MRAM density is also lower than DRAM today. Everspin will be sampling 1Gb chips later this year, while DDR4 DRAM is at 8Gb today. Today's MRAM is built on a fully depreciated 40nm process, so there's lots of room for density improvement.
The Storage Bits take
As I've noted before, NVM will be a much bigger deal than flash SSDs ever will be. With major players like Microsoft jumping in to support NVM, the question is when, not if.
NVM technology is still a horse race, with different NVMs offering different speeds, endurance, power and cost. Intel is pushing 3D XPoint hard because the potential market is huge: not just memory, but system upgrades as well.