Overclocking P8400 | PM45

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I thought I might have a go at CPU overclocking just for the hell of it before it becomes too hard, but would prefer a software solution to increasing the core voltage if possible. Anyone know what needs to be done?

Trouble is As far as I know my clock generator does not have any overclocking possibility other than changing the PLL from 266MHz to 333MHz so the software change would have to be done at boot time.

The laptop is a CQ45, system board very similar to the older DV4s.

[moral hazard]

So what PLL is it?

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It's the one you posted a link for earlier SLG8SP553V. Thanks for that by the way, the only datasheet I could find was for the 64pin version.

Unless there is some obscure factory test code to change clocks as far as I can see it's pretty much a going to have to be a 266MHz to 333MHz change which I believe will require a VID increase.

[moral hazard]

Ok, download setfsb and select SLG8SP513V.
press diagnosis, then press getfsb. then press capture. please post the screenshot in the capture folder here.

you can try to move the top slider to the right a little then press setfsb to overclock. It may work but just post the screenshot first so we can see your PLL registers.

[moral hazard]

be carefull this may void your warrenty and destroy the notebook!!

[moral hazard]

BTW, you can email abo about support for your PLL, read his website for instructions and make sure the email is polite or he may not help.

Also you may wan't to read the following thread:
PLL Pinmod Overclocking Methods and Examples

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SetFSB will not work with this chip, it is a low cost Montevina custom chip that has no special divide by M/N overclock registers.

I have already been able to set 333MHz / FSB 1333MHz but cannot get Windows or other MP OSes to fully boot without crashing. I am thinking it is because the CPU core voltage is too low but I'm only guessing. Not having tried CPU OC before it could be something else I suppose.

The strange thing is if I disable one of the cores I can boot into Windows with no problem and the ironic thing is because I'm only using one core the x9.0 muliplier is enabled resulting in a CPU clock close to 3GHz.

Running Orthos with the one enabled core and default VID results in errors, but using nhc to step the voltage up one notch seems to sort it out. I'm reluctant to do any more testing until I get this VID sorted as running just one core defeats the purpose of OCing.

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maybe you can do a voltmod?

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Umm... I was hoping to avoid that. I'll have to have a think and see what I can do. Shame I don't have an overclockable chip such as yourself.

FWIW here's a CPUZ validation, at least the northbridge seems up to it at 1333MHz

[moral hazard]

I know this is a stupid question but I will ask it anyway;
does your bios allow you to lower the multiplier?