Although you are almost certainly correct, I’m curious if there is a case where faster doesn’t mean more power efficient I.e. more concurrency but more power overall
Concurrent execution is ~always less power efficient than serial execution. I have no idea what the parent comments are talking about. For almost any work X with time to run on a single core T it will run on two cores in time larger than T/2, and on three cores in time larger than T/3, ... This is due to synchronization overhead (e.g. networking, locks, delays) and also often due to shared resources getting saturated (e.g. VRAM on a GPU).
That is unless in the serial execution you still have to pay for some resources that are unutilized.
However, if you're running a computer with a 16-core CPU, power usage doesn't scale linearly with cores. There's a lot of overhead, especially if you're talking about a laptop/desktop with display, HID, etc.
