[senttoschool]

It doesn't necessarily use half the power. But it does have greater than 2x in perf/watt and it has noticeably faster ST performance.

[UniverseHacker]

Aren't those roughly equivalent in a cpu which dynamically varies its clock speed and power consumption in response to compute demand?

[wtallis]

Performance vs power across a CPUs operating range is not a linear relationship. Which is why a naive perf/Watt metric like Notebookcheck does at each chip's top operating point is almost worthless for comparing efficiency. You need to at the very least normalize to either the same power or same performance, but preferably reviewers should be measuring and reporting a full perf/power curve for each chip instead of just one data point. Geekerwan seems to be the only reviewer that understands this, and they mostly focus on phones.

[senttoschool]

I think Notebookcheck uses peak power in their perf/watt measurements.

They go over it in detail here: https://www.notebookcheck.net/Our-Test-Criteria.15394.0.html

[rangestransform]

nope, IIRC power scales with the square of clock speed