voltmodding laptop processor

[kaltag]

Good evening. I've just taken off my heatsink on my p4 based laptop and replaced the white stuff with AS3 and it's made a huge difference!!! Runs cooler and runs the fans alot less which has helped to improve battery life. I am now looking for another way to increase batery life and got to thinking about volt modding the P4 in it using a pinmod. It's a desktop processor not the mobile so it should be the same procedure as a regular desktop P4. My question is does any one know if the laptop mobo will have a fit if the processor voltage is lower than normal? Also how tolerant are the P4s to undervolting? Appreciate any feedback from you.

 

[Quailane]

I'm not sure if you really can. I know how to do this for the athlon, but I've never seen a pin mod for pentiums.

 

[OperativeSix]

I've heard of people getting some 2.4c's to run at a mere 1v, but this requires quite a bit of luck. Would definately help the battery life if it worked though.

 

[Albuquerque]

I don't think Intel has a pinmod for lower voltages, at least not yet. Maybe when we start getting the VRM pinout specifications for the 1.2v socket-478 Prescotts then we can carry that knowledge over. The only other problem is, would your BIOS in the laptop actually understand such a voltage mod?

That bios had no use for variable voltages, and the creators likely knew it was going into a laptop and as-such wouldn't need to support different voltage processors. It's likely that, even if a mod did exist, it still wouldn't work.

 

[sandman001]

Actually, don't some P4's run at 1.55V stock, and some run at 1.5 or 1.6?

 

[kaltag]

Mine is 1.55v. I could have sworn that a volt mod existed for these things, oh well. Is there by chance a pin mod to slow the chip by either multiplier or bus??

 

[Lancelot]

I'm wondering about this too. My HP laptop has a 2.3Ghz 512kB P4 CPU that runs at 1.3V. I can't find any useful info on it though. CPU-Z crashes, and both Sandra and an older version of WCPUID report the CPU as a Northwood 2.3Ghz running at 1600Mhz?! Must be the speed-step thingy I guess. The things I wanna find out is if this is a socketed CPU (so I can improve the cooling) and how I can make sure it's ALWAYS running at 2.3Ghz...