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Overclocking My Dell Latitude C400


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#1 Andrew

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Posted 06 August 2006 - 06:12 AM

I'd like to overclock the CPU (Intel Pentium III M, 1.0GHz) on my laptop (perhaps get it up to 1.2GHz?) but there seems to be no way to do it! Upon entering the BIOS menu, I can see the CPU info like speed, model, manufacturer, etc. but I cannot alter either the clock speed or the FSB speed (which isn't even listed!) and I understand that these are the two main settings involved with overclocking.

Also, according to the AIDA32 diagnostic I ran, the Current Clock of the CPU is 1000MHz whereas the Maximum Clock os 1333MHz, what gives?

Dell Latitude C400
Intel Pentium III M, 1.0GHz
512 MB RAM
Windows XP Home SP2
BIOS Version A12 (Dell)

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#2 Mr Alpha

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Posted 06 August 2006 - 06:31 AM

They usually don't have overclocking options in laptops, since they are prebuilt in accordance with a specific thermal envelope.
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#3 Xpert

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Posted 06 August 2006 - 06:39 AM

Most pre-built system from major companys have locked bios. My old Compaq had a locked bios.

#4 Andrew

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Posted 06 August 2006 - 07:55 AM

Most pre-built system from major companys have locked bios.


Well that blows donkey feces! :thumbsup: But I guess it makes sense that a laptop has certain thermal issues like that. :flowers: Thanks anyhow. :trumpet:

#5 snoopy1alpha

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Posted 20 August 2006 - 02:02 PM

I have the same laptop model (bought a used one at ebay).
My problem is, that someone (or something) has "underclocked" my Frontsidebus. I am looking for a solution to change the FSB back to 133 MHz (instead of 33 which it has at the moment).

I found two tools: softfsb and clockgen.

Both programs are able to adjust the FSB while running but I don't know the name of my PLL (the clock generator).

I played a bit with clockgen but without success. Theoretically the program is able to change the values stored in the PLL directly but I can't interpret them correctly.

Does anyone know which PLL is built into a latitude c400?
If anyone does, these programs (or one of them) can be used to solve my problem and to overclock the laptop if this is wished.

Thanks alot!

#6 Andrew

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Posted 21 August 2006 - 02:08 PM

Inoticed my laptop running at less than top speed. It seems that the smart battery settingsin the BIOS can dynamically reduce the CPU clock (and the FSB clock, I think) based on need and power availability.

Try paging through the BIOS menus for your answer.

#7 snoopy1alpha

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Posted 22 August 2006 - 09:05 AM

It is very kind of you that you try to help, but do you really think I did not check everything out that came into my mind?
The Bios shows me wrong values for the CPU speed and I tried various settings fpr speedstep. The only think speedstep (in this case) changes is the multiplier and not the FSB. I think only Nforce-Chipsets are able to manipulate the FSB for power management reasons.
The Latitude c400 has an Intel chipset.

BTW I know which PLL is built into the Latitude C400 (ICS 950805AF) but it is not compatible with softFSB and clockgen.

I will solve the problem by replacing the mainboard.




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