Comment by bcrl

The death knell for Optane was caused by the fact that the persistent memory had errors rates that required error correction. Lower error rates than flash, but greater rates than DRAM. This meant that remapping was required (wear leveling is a factor), which meant that the controllers couldn't run in the narrow window of time required to hit DRAM level latencies. With enough development they could have worked this out, but as Intel is addicted to monopoly level margins on CPUs, they couldn't justify the expenditures on developing a memory technology that would take a decade+ to mature.

There is MRAM available with DDR3 interfaces, albeit with a relatively small page size compared to standard DRAM. It's a bit expensive. We'll see if ReRAM ever gets commercialized. There are lots of persistent memory technologies possible, but it takes a lot of money to commercialize such a bleeding edge product. Especially when DRAM keeps getting faster (in bandwidth, not latency) interfaces every few years.