I'm surprised by your post, chipguy. That is way oversimplified.
...
You can add an architecture feature that might buy you 2% in benchmarks, but adds 5% in power consumption.
If you want to talk at the level of choices deciding 3%
changes in computational power efficiency, well yes, my
description is oversimplified. But if you thoughtfully
consider the two major qualifications in my post as well
as the comment I responded to, you should find my post
both correct and IMO a useful way to think about things
at "the big picture" level.
Newtonian physics is a "way oversimplified" version of
relativistic physics. Nevertheless it is still quite useful
way of thinking for many purposes. ;-)