Andrei Dorofeev wrote: > Hi Mike, > > I would agree with Aubrey that T-states don't save power if by "save" we > mean that we can do the same amount of work at the same amount of time > while consuming less energy. I don't think P-states meet this definition of saving power, either, do they?
I'm not arguing in favor of the use of T-states at all; I think they're mostly an artifact of the ancient times in which CPUs didn't have programmable clocks and voltage regulators. However, dropping into a "higher" P-state results in less work being done in a given (same) amount of time, just like dropping into a "higher" T-state. The power savings from P-states is superior, of course. No matter what, we're talking reducing the amount of work the CPU is doing to reduce the power consumed by the CPU. It's just physics. Dana
