And my comment was about M1 comparison articles, of which this was one. And which exhibited the property I mentioned.

It does this poorly. They compared the currently most optimized whisper implementation for M1 against an implementation that is far from the best currently available for the Nvidia GPU. They cannot make a claim of reaching 70% speed at 25% power usage.

Edit: The article has been updated to compare against a faster implementation for the Nvidia GPU and no longer makes that claim.