I can run my N100 nuc at 4W wall socket power draw idle. If I keep turbo boost off, it also stays there under normal load up to 6W full power. Then it is also terribly slow. With turbo boost enabled power draw can go to 8-10W on full load.

Not sure how this compares to the OrangePI in terms of performance per watt but it is already pretty far into the area of marginal gains for me at the cost of having to deal with ARM, custom housing, adapters to ensure the wall socket draw to be efficient etc. Having an efficient pico psu power a pi or orange pi is also not cheap.