For the most part, because you'd be IO-bound, and you'd be limited by single-threaded speed.

A better architecture is to have the same, but as a co-processor for highly multithreaded tasks. That's basically a GPU. You get a few thousand cores on an NVidia 3060, in an architecture designed for this.

To the other comments in the thread:

- I'm mostly giving big-O / ballpark numbers.

- In terms of power, Pentium IV was 180 nm - 65 nm. A 7 nm process can be much more power-efficient.