for Centrino (Pentium-M) - ways to decrease CPU power?

[Miles Keaton]

Can FreeBSD tell a Centrino (Pentium-M) CPU to decrease its CPU power?

I have a laptop (Gateway 450ROG) whose CPU seems to run hotter in
FreeBSD doing *nothing* than it does in Windows doing almost anything.
  So much so that the loud "emergency" fan kicks on often to cool the
CPU, even when the computer is doing nothing at all.

I'm using the newest FreeBSD 5.3 release, but had this same problem with 4.10.

Any advice?  Anything I can put in the kernel or boot-scripts to tell
this Centrino to take it easy?