The N100/150/200/etc. can be clocked to use less power at idle (and capped for better thermals, especially in smaller or power-constrained devices).

A lot of the cheaper mini PCs seem to let the chip go wild, and don't implement sleep/low power states correctly, which is why the range is so wide. I've seen N100 boards idle at 6W, and others idle at 10-12W.