The PSU is critical and lower the system power draw the more complex the more difficult the calculations become. I’ve been through 9 PSU’s.
9 PSU's, Lord! I have always seemed to get away with either a Nightjar fanless PSU or a PICO PSU in a Streacom (in a build years ago).
The motherboard and PSU are usually more important than the CPU to the overall power use @ idle (assuming the same gen/socket of CPU) and if the power consumption is very low, they're much more important.
Mobo then I will look into next thanks.
			
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) etc
	
, yup lets not even talk about its consumption