If you are running only open source software, you may want to consider this:
I've been seeing people try to make power architecture (ibm) servers a thing for 12+ years now, it never happens, because ordinary developers can't afford them. Compared to what you can put under your desk for a thousand bucks based on any Intel or amd, amd64 architecture system .
Or this? https://www.raptorcs.com/content/TL2B01/intro.html
$2700 and probably is outperformed by a $150 ryzen cpu on a $110 motherboard.
Except that it won't have open firmware on a CPU hardly anyone targets. Whatever you build will probably be vulnerable. Unless you're running OpenBSD or something.
In case you are curious to see benchmarks.