If you use motherboard thats not ment to use mobile cpu-s, you probably get this situtation. I have the same situation multiple times if i use s478 mobile parts in desktop chipset and desktop bios, low mode you get. With AMD its bit better.

you probably did't get the point.
advantech board based on a desktop chipset.

there is a way to force cpu to work always in performance mode like this industrial board did.

On P3 is speedstep controlled only with GHI# or does it need to be sequenced with Deep Sleep as on P4M?

Have a look at this https://www.youtube.com/watch?v=3x2tBoZKz3E it's for P4Ms but might give you some ideas

Did someone swap the mobile CPU onto Slot1 PCB?

1. yes it is required a deep sleep, but...

advantech and any mobile motherboards (laptop) will force cpu to performance mode if GHI# grounded immidiately after start.

2. I did.

dm- wrote on 2025-10-28, 10:56:

1. yes it is required a deep sleep, but...

advantech and any mobile motherboards (laptop) will force cpu to performance mode if GHI# grounded immidiately after start.

2. I did.

Check if speedstep is software controllable directly on your cpu:
https://falcosoft.hu/sstep.zip

It's a DOS tool but if it works you can place it in autoexec.bat for Win9x.

dm- wrote on 2025-10-28, 10:56:

2. I did.

Hi!
Could you please detail how you did it?
Any new addition to how-to is welcome 😀

If you cut all pins and then soldered it to the pcb, could it be possible that a solder ball isn't actually soldered to its receiving pad?
Just a hunch after watching many reballing videos.

dm- wrote on 2025-10-28, 10:56:

1. yes it is required a deep sleep, but...

advantech and any mobile motherboards (laptop) will force cpu to performance mode if GHI# grounded immidiately after start.

2. I did.

I wonder if the Advantech BIOS plays with some CPU registers at boot, not unlike what you found out with the GX swap. Assuming the boards are close enough (chipset and SIO I'd say) what happens if you put an Advantech BIOS on your board?

Nexxen wrote on 2025-10-28, 11:27:

If you cut all pins and then soldered it to the pcb, could it be possible that a solder ball isn't actually soldered to its receiving pad?

P3Ms are all BGA to begin with, even the socketed ones are just BGA chips soldered onto an interposer with pins.

andrea wrote on 2025-10-28, 12:18:

P3Ms are all BGA to begin with, even the socketed ones are just BGA chips soldered onto an interposer with pins.

Oh, yes. I made a huge mistake.
This happens when you write before your brain steps in 😀
---

I'll follow this as it is interesting.

What about soldering mobile Tualatin to Slot 1 PCB?!? Have not compared datasheets whether pinouts are same or different.

steps to create mobile slot 1:
1. desolder bga mobile chip from interposer, clean, reball.
2. desolder bga chip from slot1 interposer, clean the board.
3. solder mobile chip to slot 1 interposer.
easy peasy.

i flashed advantech bios to flash and booted from it on my gigabyte ga-6bxc. it's booting, but cpu still in 7x low performance mode.

dm- wrote on 2025-10-29, 03:22:

but cpu still in 7x low performance mode.

What happens if the multiplier in the BIOS is changed from AUTO to, for example, "8"?

no such option in bios

What about VID? Mobile PIII uses different VID values for performance vs low power mode.

configured 1.6v on cartridge

Not sure if it helps but I converted my 600E from P2 to MMC-2 P3 when reading it on wimsbios forums and it required a resistor mod to enable full speed. Here's original thread of this whole mod: https://www.wimsbios.com/forum/viewtopic.php? … b1e2436f9110899

dm- wrote on 2025-10-29, 05:40:

no such option in bios

As I wrote above check if speedstep MSRs are present on not. If yes then FID/VID can be changed by software.

this is a first release of speedstep technology and it does not had any msr registers at this time

if it's a Coppermine mobile then it has an incredibly hacky way of switching the clock multiplier IIRC. something to do with briefly pulling the CPU reset line high? the later chips used a register that was specific to mobile versions of the ICH i believe, but the pin should be present on desktop ICH chips