Simply - install linux, then FreeBSD on same machine and check it :)

:D
ya that's what's important here at least.

anyway - just using hlt instruction greatly reduces CPU power usage even at full clock. i don't think the difference is THAT huge by reducing clock multipliers, voltage etc.

on my laptop i don't even looked at this, and it works about 2 times longer under little CPU load than under full load.

and it has hard drive and display that use power. CPU itself isn't big power eater (it's pentium-M 1200).

Of course on "modern" CPUs having >>100W TDP it may make a difference.

not that i'm concerned, i'm not going back to linux (even though i
liked it while i used it).

me too - until kernels 2.0.*, then it wasn't usable (stable) anymore.
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