Earlier quoted context omitted.
A slightly less-performant server is better than no server :) I gave up on worrying about those details - just installed ProxMox, set it on a shelf in the basement, moved on. Works great for the tasks I'm running.
Well, it depends on what you use it for. I was thinking about using it for distributed workloads which is more intense than average. I was even thinking about how much mileage could one get from a rack of old laptop logic boards. Gaming laptops sold for parts are much, much cheaper than "real" server hardware. It appeals to me because of the reuse aspect as well.
Holds true regardless of your workload :) Imo sounds like premature optimization.