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Pentium M centrino switching frequency

By natty_dread78 ·
Hi all,
I have an HP laptop (dv4275EA) with a pentium M centrino 1.7GHz. I noticed recently that the CPU changes its frequency from time to time (I know it's normal), so I installed speedswitchXp to have it run at full speed.
However, the CPU still changes its frequency when under heavy load (e.g. games), it switches from 1.7 GHz to 900MHz, but the multiplier does not change (x13). Typically, it would run at 1.7GHz for about 5-10 mins, then gets down to 900MHz for about 3-5 mins, then gets back to 1.7, etc...
So I wanted to know if such a behavior is normal. Does the cpu lower its frequency in response to a thermal event ? Then gets back to full speed when it has cooled down ? Is there a way to have it run at 1.7GHz no matter what, and is it dangerous to do so ?
Thxs in advance,
N_D

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Two things are important here

by HAL 9000 Moderator In reply to Pentium M centrino switch ...

The first is the Thermal Capacity of the CPU and the second is available Power so if you where running off the battery it would slow down to save the battery life.

As for Heat when these reach a certain temp they slow down till they loose the excess heat and then switch back to full speed again till they heat up again.

Is there a way to have it run at 1.7GHz no matter what

Probably

and is it dangerous to do so

Defiantly unless you like replacing CPU's on a regular basis and paying for them because you've forced them to bypass their protection circuity.

If you want to help your NB buy a NB Cooler that is a USB powered device that the NB sits on and has lots of air circulation under the NB so that it keeps the CPU cooler. Like the ones here

http://tinyurl.com/39j3ou

Col

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