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#1
Oddysee

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My mate brought over a laptop today and asked me if I wanted to buy it. In which I wasn't interested. Something did interest me though.

When you right click my computer/properties. Under the computer info. It stated it was a Pentium 4 2.00 GHz then under it, it stated 1.99 GHz, 512 Mb RAM.

I looked at my computer/properties about 2 minutes later and it stated the processor was 1.20 GHz. Every time you go to my computer/properties, sometimes it would read 1.99 GHz (which would be normal) and other times 1.20 GHz.

I'm not after a fix as I wasn't interested in the laptop. I would like to know what was causing this to happen. Could the processor be faulty?

Also when you hit ctrl+alt+delete and read the performance CPU Usage. It never went above 4%. So nothing strange there. The laptop was also plugged into the mains.

Edited by Oddysee, 26 December 2008 - 01:04 PM.

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#2
makai

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What you're witnessing is called "Speedstep", or "Dynamic Switching".

Laptops can run on batteries, so power setting adjusments allow the processor to run at a lower speed, depending on the workload, to extend battery life. You can change the way the dynamic switching works by changing the Power settings of the laptop. If you choose "Always On", or something like that, the processor will always run full speed, but then, battery life (and heat) become a factor. If you choose "Max Battery", the processor will always run at the lowest rated speed.

Manufactures will normally set the laptop up for dynamic switching so nothing is wrong with your friend's laptop. It's working as designed.

Edited by makai, 26 December 2008 - 01:24 PM.

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#3
Oddysee

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Ok, thanks a lot mate.
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