[ChuckMcM]

I understand. I would expect that you will get an additional boost if you target Intel's 'Optane' technology which, by its design, allows for a much faster channel turnaround and so less interference. And in the fairly recent past other vendors like Texas Memory systems developed strategies which were all RAM and a bit of cleverness to snapshot to HD when the power fails. The point being that with enough money you could brute force the solution, but now the money required it decreasing and so new strategies are opening up.

[chaotic-good]

If I understand this right, with Intel's Optane you will eventually need to write everything to HDD because data collection happens at steady pace and the cache size is limited.

[ChuckMcM]

Depends on the size of your data set. Intel's plan, according to their web site, is to replace the SSDs (especially NVME ones) with Optane based solid state memory. The road map has them shipping exabytes of the stuff eventually.

So as I see it you'd be constrained by 32GB Optane modules today, but they will eventually (one, maybe 2 years) be 2 TB modules like the Samsung 960 Pro modules are today. And an M.2 port is really just a PCIe slot so you're looking at systems with maybe 32 TB of Optane storage on the high end within the next 5 years.