well you would be correct  if you only run  the 2pacs and compacs.

if you run other mining software windows 10 and windows 7 on a pc are fine.

At the moment I run cgminer and nicehash

this give me 1 compac 1 2pac and the cpu mine xmr on the same pc.

the cpu xmr  adds about 10 or 15 watts  ands net a very small profit.

which means the 1 pac and 2 pac   cost no extra on the mobo or cpu power use.

so I do better then a rasp pi but  the pc cost me  $$$ it is a lenovo m700  and I upgraded the cpu

http://i.imgur.com/gYHFkwz.png