Often I see the power draw of a Pi or similar board being stated as incomparable with a Intel x86 platform.
Well, i think, looking at my own setup, that when smart choices are made, this does not need to be a big difference.
I’m running HA on a SFF PC with Intel Celeron J1900 quad core and 4 GB RAM.
The PC + Zwave dongle + RfxTrx dongle + Sonoff 433 MHz hub + 3x MiLight hub is running on continuous 9W of power.
The processor runs at 7-9 % of its capacity.
So in my eyes, the computing power / electric power draw ratio is very satisfying and really worth a consideration. And, you can actually buy those everywhere 