Free software to reduce your notebook's power consumption, heat and noise. Hopefully it saves you money too.
So far it's provided benefits on an Intel notebook, didn't seem to on a Celeron (it said it was still running at maximum processor speed all the time) and RockDJ reports that it will provide benefit on Dell notebooks though it might show you the change in processor speed on it's display.
On my notebook, it's switching the CPU between 0.8 GHz and 2.13 GHz, depending on what I am doing and what I need. (eg typing into OzBargain while running a bunch of programs in the background only needs 0.8 GHz)
This reduces the power my CPU is using (slower CPU -> less power consumed).
That reduces the heat produced by my CPU.
This reduces the speed my notebook's fan has to spin at to keep the notebook cool.
That reduces the noise my fan is producing (volume and pitch) and it also reduces the energy my notebook's fan is consuming.
This is freeware software I am trying out based on someone else's recommendation. But maybe it can help you too (unless your notebook came with software that does the same)
Once the software was installed, I didn't have to do any tweaking to get it to switch CPU speeds for me, either :)
This might not be a time limited bargain, but I suspect it'll be a bargain for a number of other users who hadn't heard of such software. :)
As always good luck and be careful with new software …
Isn't CPU frequency stepping built into the operating system?