how to monitor cpu frequency?

Hi,

I'm wondering if it's possible to see what frequency the cpu is using (this would be for an Intel based system - Macbook Pro).
Is there some sort of widget that allows this (I'm not after the CPU usage %, just the frequency)?
Or some CLI command or logfile?
I read about the CLI command 'pmset', but I don't know if this works for intel-based machines.
Also, it just seems to have a possibility to disable/enable the 'reduce' option.

Many thanks,
Sven