How to underclock CPU in windows XP?

[nauru]

Please can someone tell me a fairly simple and effective way to do underclock my CPU. Thanks.
I'm guessing I have to reboot my system, enter the bios screen and then lower the voltage... less power coming through the system = less heat generated, all else being equal, right? But how do I know what voltage levels are supported by my PC? Will the bios allow me to input a lower value that actually damages my computer? (I can understand that higher voltage would increase strain on the system, but what about lower voltage, is there risk in that direction as well, or no?) Thanks for your patience with my nooby questions.

Also I would like to have direct control over the fan speed for my laptop. I tried speedfan but it doesn't recognize the fan in my system.

Thanks.

This is all trying to get the laptop to run cooler.

I've already cleaned the interior, heatsinks and exterior, it already has a new fan, it already is propped up to help with airflow around the base of the laptop, etc. I'm looking for software solutions to lower the heat level at this point, costless please. Many thanks.

[ShadowVlican]

i doubt your laptop has voltage controls

if this were a desktop with a half-decent motherboard, you'd go into bios and lower the voltages, then run some stress testing program in whatever OS... if pass, lower voltages some more... if fail, go back up

i've never killed anything by lowering voltages

[aviador]

Please can someone tell me a fairly simple and effective way to do underclock my CPU. Thanks.
.....
This is all trying to get the laptop to run cooler.


I have used rightmark cpu clock utility to undervoltage laptops with amd cpus.
http://www.softpedia.com/get/System/System-Info/RightMark-CPU-Clock-Utility.shtml

I upgraded the cpu and it run hotter than the original, and the fan kept buzzing too loudly to my taste. The original cpu had a thin thermal pad which I replaced with high performance thermal paste, cleaned heatsinks, fans, ducts, etc. but to no avail. The heat system was designed to work right just for the original cpu, I guess. --the TDP of the original and the replacement cpus were not that far appart.

The utility worked fine but throtled the cpu, so it still got hot and noisy when highly loaded.

It is a little trial and error. You can define states, multiplier and voltage at certain load levels in some profiles, until you get stable -- no shut downs, reboots, etc. IIRC, to save those profiles and make them active you must close and open the program.

This might work for you.

[xalex0]

Set power mode for maximum saving. Without the model number that's all that can be suggested.