Now, keep in mind, this doesn't account for things like dual or quad channel which bumps up the bandwidth even further though doesn't really affect latency.
The fastest and most reasonably priced consumer NVMe I could find:
NVMe Latency = 200000ns
NVMe Bandwidth = ~3GB/s
The fastest consumer (or low enterprise) grade persistent storage is terribly slower and takes longer to respond than the cheapest DDR5 ram.
Still waaaaaaaaaaaay slower than ram, but getting closer. Before giving up on optane, intel used to make memory modules with optane on them (as a form of backup I think)
DDR5 Latency = 16.67ns
DDR5 Bandwidth = 64GB/s
Now, keep in mind, this doesn't account for things like dual or quad channel which bumps up the bandwidth even further though doesn't really affect latency.
The fastest and most reasonably priced consumer NVMe I could find:
NVMe Latency = 200000ns
NVMe Bandwidth = ~3GB/s
The fastest consumer (or low enterprise) grade persistent storage is terribly slower and takes longer to respond than the cheapest DDR5 ram.