I'm all in for re-using, re-purposing old computer hardware but I'm weary of the power consumption at the same time. So if there is a choice of SBC(ARM) vs old

I'm all in for re-using, re-purposing old computer hardware but I'm weary of the power consumption at the same time. So if there is a choice of SBC(ARM) vs old x86 computer, I would definitely recommended a SBC especially since it consumes fraction of the power and matches or sometimes even exceeds the performance of a 5 year old x86 computer depending upon the task.