The Ultimate Pentium-m Pinmod/Voltmod Guide

[betterlife18]

Yeah I flashed to the latest BIOS. The only difference I noticed in the BIOS was that instead of 128MB being my only shared video memory option, it changed to 64MB and 128MB options. I know this has nothing to do with the FSB, but I'm still going to try and do this mod again this weekend, just in case I screwed up somewhere like forgetting to tighten the socket

 

[betterlife18]

GRRRRRRR

It still didn't work!

I guess Acer is just going to be an *** to me and not let me get my monies worth out of my 735 chip.

 

[ozzlo]

OMG I GOT IT!!! when your looking at the socket diagram those are the holes in the socket not the pins in the processor, I remember somebody else doing this and the spot where they actually needed to mod was in the opposite corrner of the cpu...



wait.... did the laptop come with a 533mhz chip? or did it come with a 400mhz chip?

it sucks you can't get it working I wish I was available in person to tweak with it...


there's 4 things I'm thinking of...
1. the chip can't handle it / maybe a lil more voltage...
2. your doing something so silly you would smack yourself if you realized your sillyness
3. Acer is really evil
4. Intel is evil and I'm missing some critical peice of information...


I have a theory for how to check to see if the cpu really can't take it (aside from dropping it into another laptop that is pre- pinmodded )

Before you begin the mod... take the chasis apart n all but leave the little watch battery intact and plugged into the mobo. turn on the compy and go into bios settings and disable speedstep then save and exit the bios. Continue disassembly but (DON"T UNPLUG THE WATCH BATTERY) now do the mod again and then boot it up... It should force the computer to startup at 800mhz instead of full speed. If it boots this time, then the cpu can't take the overclock. if it still fails to boot then it's something else...

well that's my latest shooting off of Ideas for ya...

 

[betterlife18]

The chip is a 400mhz chip. It must be the wrong pin or something, cause it barely even tries to boot. No video whatsoever,l fan spins for like 4-5 seconds then stops, and the power light stays on. As soon as I hit the power button the light goes off. I see the numbers next to the socket and that's what I went by. I really don't want to take this beast apart down to the CMOS battery... and get this, there are no speed-step options in the Bios, it's all manually controls within Windows.

 

[ozzlo]

it's starting to seem less and less likely that you pinmod is going to work... about 10% of em refuse to work.

your laptop can support a 533mhz chip right? I'm starting to ponder just how evil acer can be...

I'm afraid I'm running low On Ideas, I'll shoot ya a pm if I think of anything groundbreaking... sorry for your "non overclock"...

 

[smekta3]

If an IBM laptop can be pin modded its pretty odd that Acer cant. The "dying" symptoms perhaps show that it cant handle the 533mhz, happened when I flashed my vid card from pro to XT, fan ran for a few seconds and than turned off. Perhaps its something to do with ram, even though I havent heard of anyone having problems with that before.

 

[WarlordOne]

I've had my laptop pinmodded for almost 2 years now but I just wanted to say this is a great collection of info here. I started with a 1.4 CM @ 1.86Ghz but upgraded to a 1.6 PM @ 2.13Ghz when the prices went down. I also haven't seen too much info about pinmodded desktops.

I also built a PM desktop because I wanted a cool quiet SFF system. I'm using the ASUS p4p800vm motherboard with the CT 479 adapter. A pinmod is as simple as moving a jumper. The only downside is that the bios sucks for overclocking. So, additional speed is gained from using software. I put in it a 1.5Ghz PM is "pinmodded" to 2GHz and then further OC'd to 2.4Ghz via software. I've gotten it as high as 2.6Ghz but with the tiny heatsink it's not perfectly stable and it's not as easy to get more volts from the adapter. So, until I feel like more soldering and bigger heatsinks that's it for now.

 

[JHaenf]

Voltmod shows no effect

Hi there,
hopefully anyone is still here to help me with this:

I successfully clocked my P-M from 1,8 to 2,4. As Prime95 signals problems, I tried to set up the voltage using this guide.

The strange thing now is that neither CPU-Z nor NHC report any changes in voltage, it is stuck at 1,340.
Until now, I set the VID2 (should be 1,404).

Thanks a lot for your hints.

(Notebook is a Fujitsu-Siemens Amilo M3438G)

 

[ozzlo]

There is no actual "voltage sensor" on your processor that tell you exactly what your voltage is. You cannot check the modded voltage with any software tool. The processor only reports what it's supposedly running at not what it's actually running at.


This is why it is so Imporntant to follow my guide to the letter and keep those spreadsheets (ESPECIALLY THE 2nd one) around so you can see just what voltage your processor is really running at.


Sorry for the late reply, I currently have 2 full time jobs and I just haven't had any time to read the forums lately (oh wait you posted today... ok nevermind
Did the voltmod stabilize your processor?

 

[JHaenf]

Sounds logically. I just was not really sure, because I didn't see not a slight change in stability when trying out the first few steps up. I think now I really understood the whole thing... at last

Seems like it is stable now at 1,436v (exactly as your graph shows), I currently am running Prime95 for two hours now and going on.

Let me also say thank you for your great work. I really hope your brains pay off in jour jobs (so that you could get along with just one sometime) ...

 

[nothinghr]

Hi, i've a toshiba satellite notebook with intel 915 chipset. My processor was a pentium M 740 until i decided to try a pinmod so i buyed a 735 on Ebay.
Now i've tryed to boot first with new processor unless pin mod only to see if it works but the notebook doesn't start at all and i only can heard the fan for few seconds then nothing happens. Is it possible that toshiba bios blocks an older processor?
Thanks!

 

[lennytiger]

Does anyone know of a way to permanently pin mod a pentium m to underclock it rather than overclock it. It must somehow be possible.

My fan has failed on my lappy but I can't get hold of a new one anymore. At the moment I am using speedswitchxp but a hardware mod would be nice because then i wouldn't have to use a HUGE fan to cool my laptop if i should need to install windows again.

 

[ozzlo]

I no longer have a host for the files for this guide please PM me if you would like me to put the files back up on a server. I figure that Pentium-m is a bit outdated now so If you are interested in seeing all of the documents I would be more than happy to get them back up, otherwise it's not very high on my priority list.

 

[mikeccuk2005]

i managed to get 2.52ghz with 1.4v
thankyou, i mean alot!

 

[parko]

G'day,
I have a 1.5GHz Celeron M in my Compaq Presario v4000 that i have so far OC'd to 2.34Ghz using a combination of the pinmod and setfsb. I'd like to get it to 2.4GHz+ but to do so ill need to do a voltmod. I'm pretty sure that the stock voltage is 1.260. would it be possible to bump the voltage to 1.276 or even 1.292v (which i think is the recommended max voltage)?
if so, what VID pins would need to be shorted?

I've tried to understand the process as best as i can but with it being such an old thread none of the links are working. so any pictures or diagrams would be greatly appreciated.

thanks in advance!

 

[parko]

i did some more research...

the stock voltage for a 1.5GHz Celeron M 370 is 1.260v which i worked out to be:

vid 0 =.016v normally requested
vid 1 =.032v normally requested
vid 2 =.064v boost
vid 3 =.128v boost
vid 4 =.256v boost
vid 5 =.512v normally requested
+ the .700v

does this mean that the smallest boost i can gain from a voltmod is .064v?
if so, that would bring the total voltage to 1.324v. would that be to much for the chip to handle given that the voltage range for that chip is 1.004v - 1.292v?
also, as of yet i have not found a program that will let me reduce voltages in windows, so the method of volt modding a high voltage and reducing it via software is not an option for me.

 

[mjf1212]

links to voltmod info are dead

I know this thread is a little dated, so sorry for resurrecting it. Does anyone still have any photos or instructions about how to locate the vid pins used in the voltmod ?

All links I've found here and elsewhere are dead and the interactive voltmod guide is gone from U of Oregon's servers.

I've got a Lenovo Z60m with a 533mhz fsb 1.86 ghz chip (750). I've just bought a 400 mhz FSB 1.7 Ghz Dothan (735). From what I've been reading, I'll likely need a voltmod to be stable with it.

The pinmod pics are still out there, but voltmod info is scarce...

TIA,

MJF

 

[ozzlo]

LOOK WHAT I FOUND!!!!!!!!!!!!!


MERRY CHRISTMAS GUYS!

I have found the pics and tables and attached them to the first few posts ENJOY!

The interactive guide can be found on page 2

 

[I.M.O.G.]

Might want to list a post number for the interactive guide in the first post - for me, page 2 starts at post 51 and I don't see the interactive guide. Pages depend on your default thread display options.

 

[kit55]

Q & A​

Q: Which chipset do I need?
A: You need the intel i915 mobile chipset(any of the variations will do) to pinmod.

Q: Will this work with the 400mhz Celeron-m processor?
A: If the processor works on the i915 chipset running at 400mhz then yes you can pinmod it to 533.

Q: If I have 400mhz ram will my ram become overclocked?
A: No the memory controller on the i915 chipset has it’s own clock generator and will only run the memory at it’s rated speed.

.

Hi Just to make sure only would you also confirm that it will also work on ATI Chipset? My Asus Laptop motherboard model is A6R with an ATI mobile Chipset not an intel i915 chipset