We have servers like this, and under a surprisingly large number of load scenarios you only get a little speedup. There are use cases where it's helpful, but there are lots of little things that slow down performance that aren't disk-bound, like single-threaded waits for a piece of networking code to timeout, or waits for code that's CPU bound, they all add up.
I used to dream of what you're talking about, but from my own experience in the last year, it just doesn't matter that much for the daily experience using a computer. 16GB of RAM is plenty right now, SSDs are very fast for many tasks, I'd look at upgrading your internet bandwidth after that if you want your computer to feel faster.
I used to dream of what you're talking about, but from my own experience in the last year, it just doesn't matter that much for the daily experience using a computer. 16GB of RAM is plenty right now, SSDs are very fast for many tasks, I'd look at upgrading your internet bandwidth after that if you want your computer to feel faster.