Apollo is Atom, isn't it? So it's not apples to apples. I'm pretty sure there were sub 10W SoC for some years before Ivy bridge.

Yes, Apollo Lake is an Atom SoC. While I am doing simple web development, performance is about the same. Mostly lacking RAM versus older, Core platforms.

But all-up, Windows 10 at 6 Watts. Including the display, storage, the whole system — or so the performance counters on the battery tell me.