Quote: "if you build your own boards"

You mean design my own computer motherboards?! Excuse me, but that is
definitely the task of experts, not computer end users. Yes, I have
knowledge about transistors, logic gates and some circuits employing
them, but that is NOT enough. Furthermore, even if I were capable and
had the resources to design and make my own motherboards, that would
not guarantee me that the actual work horses, the CPU cores, were
clean.

Quote: "Not everybody uses (recent) x86 :p"
I have a functional Pentium 4 (hyperthreading) but I do not use it.
The reason is electricity consumption, noise, and above all, lack of
performance.

--
If you can't explain it simply, you don't understand it well enough.
(Albert Einstein)
If you cannot make abstructions about details you do not understand
the concepts underlying them.