I built a buddy a cheap PC using a Lenovo M93p...it orginally came with a tiny power supply - 100, 150, at most 200w. Was nice and quick with an SSD and 16gb of ram thrown in it, neither of which would cause more power draw. (The big ass video card was a whole other matter).
Have an 11" netbook/laptop with one of those 10w celerons in it...it's faster than my old Athlon x4 for everyday tasks.
I remember plugging my watt meter in to test my current rig...the processor and video card are rated at drawing a fair bit, but it averaged ~150w under typical, moderate use, and not much over 200 being punished. And that's with monitor and everything else plugged in to the same power bar. (Idling, monitor off, I think it was all of 50 watts).
I think the power brick for my wife's 6th or 7th gen i5 is only rated for 45 watts, and it's pretty darned quick for every day tasks.
Anyway, there are plenty of cheap options that will get a much better rig than an old Althlon x3, and almost all of them will be more efficient.
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