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Persistent memory (MRAM, FERAM, and ReRAM) to replace DRAM, but it could take a decade
(www.theregister.com)
this post was submitted on 21 Feb 2024
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So could it be plausible one day to run a RAM-less computer? If persistent memory speed matched DRAM speed, would there still be a benefit to distinguishing RAM from SSD, beyond cost?
Density would be a factor as well for both cost and device dimension/weight.
Cache is way faster than RAM, but it takes up too much die space and power to be the only volatile memory.