Since moving a variety of Intel SpeedStep enabled PCs from XP to Vista, it
~appears~ that SpeedStep is not working in that System Properties ALLWAYS
shows the rated and current speed as the same (unlike under XP where it would
show the delta when system is idle).

Under Power Management I've tried changing the Processor Power State Min
from the 5% default to 0%, 10%, etc with no change. Tried Intel's CPU ID
utility and it always shows the posted and "current" speed as the max for the
given CPU.

Is Speedstep working at all, and if so, why is the lower speed not being
reported when system is idle?