WIP: Karaktu's (and Zap's!) Unofficial Guide to mobile Celeron overclocking success!

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Zap

Elite Member
Oct 13, 1999
22,377
2
81
That's not bad considering the limitations of the motherboard. At 1.2v the CPU is actually UNDERvolted, so that can explain why it won't work at higher speeds - also many boards undervolt whatever CPU is set at, so possibility of a double undervolt.

That SiS 651 chipset is FSB limited, so mobile Celerons would be a better choice due to higher multiplier.
 

astaflash

Junior Member
May 9, 2006
5
0
0
Well, I did get back to 1.6Ghz (12x133) because the RAM module doesn't like to be overclocked.

Windows seems to run smoothly at 1.8Ghz (12x150) but I get sometimes CRC errors with Winrar when extracting archives (typical problem involving memory) and those CRC errors don't occur on the same archives when I'm at 133. So I prefer to keep my data safe.

However this PC will not at end be used to run on Windows but Geexbox, then 200Mhz less is not such a big deal.
 

FelixDeCat

Lifer
Aug 4, 2000
30,111
2,463
126
I wonder if any of this would work with the Pentium 4-Ms ? Like the:

3.06 / 1M / 533 / SL7DT or SL7NA (same but renumbered by Intel in 2004)

3.06 / 512 / 533 / SL77P ?

:shocked:

I dropped one of each above in my msi neo2 i865 rev 2 and it wouldnt boot up.


edit: volt mod a no-go.
 

Zap

Elite Member
Oct 13, 1999
22,377
2
81
Sometimes when a mobile socket 478 chip won't boot up in a desktop board, doing the bent-pin voltage mod will get it to POST.
 

robertk2012

Platinum Member
Dec 14, 2004
2,134
0
0
I just purchased a Pentium 4-M 1.7Ghz CPU 400FSB SL6CH what board would you reccommend I get? Or did I screw up and get something that wont work. It was cheap so figured I would try to use it for something. Im also going to try and pick up some cheap mobile celerons so I still need a reccommendation either way.
 

HaxEJxuK

Junior Member
Dec 30, 2005
3
0
0
Sorry to ask about none mobile celeron related but it's on it's way now. The question is that reading this thread I saw some people OC their desktop P4 600mhz-800mhz with their P4 with P4S800 MX which I have with 2.53 and 2.66. How come I can only OC my 3.06 HT D1 stepping 320mhz total of 3.38ghz? I mean I would think that I could at least OC like others. would there be setting I missed? I can go beyond 147fsb which is stable till there but anything above it boots to windows only to BSoD. The ible temp is 26c', set to asychro. any suggestions?
 

robertk2012

Platinum Member
Dec 14, 2004
2,134
0
0
Originally posted by: HaxEJxuK
Sorry to ask about none mobile celeron related but it's on it's way now. The question is that reading this thread I saw some people OC their desktop P4 600mhz-800mhz with their P4 with P4S800 MX which I have with 2.53 and 2.66. How come I can only OC my 3.06 HT D1 stepping 320mhz total of 3.38ghz? I mean I would think that I could at least OC like others. would there be setting I missed? I can go beyond 147fsb which is stable till there but anything above it boots to windows only to BSoD. The ible temp is 26c', set to asychro. any suggestions?


Chips all typically perform about they same but they are binned and marketed to different price levels. That is why you buy the cheapest chip from a faimly and overclock.
 

WhoBeDaPlaya

Diamond Member
Sep 15, 2000
7,414
402
126
Got a P4 2.0A for free (yay for dumba*s techs at state surplus auctions :D ).
SL5YR - so it's a 20x100MHz B0 Northwood. Gets to 2.67GHz on 1.55V.

Benchmarking it against the two mobiCels that I have (Ainulindale, Palantir). In DiVX encoding, the P4 2.0A @ 2670 (133FSB) is faster than the mobiCel 1.6 @ 2752 (172FSB) - 5m17s vs. 5m 33s. 3DMark2001SE : 12643 vs. 12706.

Will update post with 3.06GHz mobiCel and OC'ed 1.8A results :)

Edit : Have SL6LA 1.8A (C1 stepping) - the crazy thing is currently priming @ 3420 (190FSB) :shocked:
 

Towermax

Senior member
Mar 19, 2006
448
0
71
I had a Mobile P4M 1.6 (B0 stepping) left over after a laptop upgrade, and after reading this thread, thought it would be ideal for home server. I bought a stock Intel HSF for $3.00 new and a used Asus P4P800 SE for $25 (two of the 8 USB ports were bad--hence the low price). I added a 1GB stick of Ultra PC 3200 RAM ($35 after rebate) and an old Millenium II PCI video card with 8 whole MB of ram. :)

It's a great, cool, quiet, and cheap 1.2 GHZ server now, running 800GB of drives--idles at 32C with Speedfan keeping the HSF at 1400RPM.

Just for fun, before I added the drives, I bumped the FSB to 800 and got 2400 stable, as expected. It was still stable at 2500MHz with all settings except FSB at the defaults. PCI/AGP was locked. At 2550, it wouldn't boot. Probably could get more if I bumped the voltage and adjusted the RAM divider/timings, but I didn't want to spend any more time playing with it, since I wanted a low-power server, not a hot, overclocked rig.

Thanks for this thread--I would never have otherwise found such a good use for the old P4M.
 

Zap

Elite Member
Oct 13, 1999
22,377
2
81
I also use a P4M in my server box, overclocked and undervolted. :thumbsup:
 

HaxEJxuK

Junior Member
Dec 30, 2005
3
0
0
Originally posted by: robertk2012
Originally posted by: HaxEJxuK
Sorry to ask about none mobile celeron related but it's on it's way now. The question is that reading this thread I saw some people OC their desktop P4 600mhz-800mhz with their P4 with P4S800 MX which I have with 2.53 and 2.66. How come I can only OC my 3.06 HT D1 stepping 320mhz total of 3.38ghz? I mean I would think that I could at least OC like others. would there be setting I missed? I can go beyond 147fsb which is stable till there but anything above it boots to windows only to BSoD. The ible temp is 26c', set to asychro. any suggestions?


Chips all typically perform about they same but they are binned and marketed to different price levels. That is why you buy the cheapest chip from a faimly and overclock.


But I also tried my 2.53 and 2.66 with same result. only about 300mhz and that's it. with these two, it won't even boot beyond that where as 3.06 boot and BSoD soon as I prime95 it.
 

astaflash

Junior Member
May 9, 2006
5
0
0
Back with a 2nd P4-m :)

P4-m 1.8Ghz, model SL6FH - Core C1.

Tested on a motherboard made by Gigabyte for NEC/Packard Bell on the Imedia series.
Specs: http://support.packardbell.com/uk/item/index.php?i=spec_paros
Motherboard model: GA-85648 FXM2 Chipset SIS 648 FX
RAM used: 1 X 512Mo PC3200/DDR400 Chips Samsung Tccd
Last bios installed: F15 15-08-2005
The mobo supports fsb 400/533/800.

The BIOS does not allow anything regarding frenquencies settings... but it's quite common on this kind of branded PCs. So I've decided to try pin modding (as related in first post) in order to get the cpu at 2.4Ghz (bus frequency 200) instead of doing it in the BIOS.

The CPU is dectected normally at 1.64 Vcore.

it works fine at 12x100

I tried the pin mod (blue pin) to get the CPU boot at 12x200 -> it is detected at 12x100... WTF?
I tried then the pin mod (red pin) to get the CPU at 12x133 -> it is detected at 12x133.



So I just wondering:
- if the pin scheme is the same for mobile celeron and p4m ?
- if the 200fsb pin mod is available for p4m ?
- if someone as already managed to make p4m be detected at 12x200 using only pin modding ?

Hopefully I did not broke any pin for that, I managed to bend the pins without any contact to other pins (using a magnifying glass and a very small screwdriver for clockworks)
 

rogue1979

Diamond Member
Mar 14, 2001
3,062
0
0
Originally posted by: astaflash
Back with a 2nd P4-m :)

P4-m 1.8Ghz, model SL6FH - Core C1.

Tested on a motherboard made by Gigabyte for NEC/Packard Bell on the Imedia series.
Specs: http://support.packardbell.com/uk/item/...i=spec_parosp=platform_veloce_imedia
Motherboard model: GA-85648 FXM2 Chipset SIS 648 FX
RAM used: 1 X 512Mo PC3200/DDR400 Chips Samsung Tccd
Last bios installed: F15 15-08-2005
The mobo supports fsb 400/533/800.

The BIOS does not allow anything regarding frenquencies settings... but it's quite common on this kind of branded PCs. So I've decided to try pin modding (as related in first post) in order to get the cpu at 2.4Ghz (bus frequency 200) instead of doing it in the BIOS.

The CPU is dectected normally at 1.64 Vcore.

it works fine at 12x100

I tried the pin mod (blue pin) to get the CPU boot at 12x200 -> it is detected at 12x100... WTF?
I tried then the pin mod (red pin) to get the CPU at 12x133 -> it is detected at 12x133.



So I just wondering:
- if the pin scheme is the same for mobile celeron and p4m ?
- if the 200fsb pin mod is available for p4m ?
- if someone as already managed to make p4m be detected at 12x200 using only pin modding ?

Hopefully I did not broke any pin for that, I managed to bend the pins without any contact to other pins (using a magnifying glass and a very small screwdriver for clockworks)

It is very possible the 648 motherboard doesn't support a 200MHz fsb. And yes, the fsb pin mods are the same for a P4M and a mobile celeron. So if it could handle the overclock on a motherboard that supports a 200MHz (800) fsb then the pin mod would work.

 

astaflash

Junior Member
May 9, 2006
5
0
0
Originally posted by: rogue1979
Originally posted by: astaflash
Back with a 2nd P4-m :)

P4-m 1.8Ghz, model SL6FH - Core C1.

Tested on a motherboard made by Gigabyte for NEC/Packard Bell on the Imedia series.
Specs: http://support.packardbell.com/uk/item/index.php?i=spec_paros
Motherboard model: GA-85648 FXM2 Chipset SIS 648 FX
RAM used: 1 X 512Mo PC3200/DDR400 Chips Samsung Tccd
Last bios installed: F15 15-08-2005
The mobo supports fsb 400/533/800.

The BIOS does not allow anything regarding frenquencies settings... but it's quite common on this kind of branded PCs. So I've decided to try pin modding (as related in first post) in order to get the cpu at 2.4Ghz (bus frequency 200) instead of doing it in the BIOS.

The CPU is dectected normally at 1.64 Vcore.

it works fine at 12x100

I tried the pin mod (blue pin) to get the CPU boot at 12x200 -> it is detected at 12x100... WTF?
I tried then the pin mod (red pin) to get the CPU at 12x133 -> it is detected at 12x133.



So I just wondering:
- if the pin scheme is the same for mobile celeron and p4m ?
- if the 200fsb pin mod is available for p4m ?
- if someone as already managed to make p4m be detected at 12x200 using only pin modding ?

Hopefully I did not broke any pin for that, I managed to bend the pins without any contact to other pins (using a magnifying glass and a very small screwdriver for clockworks)

It is very possible the 648 motherboard doesn't support a 200MHz fsb. And yes, the fsb pin mods are the same for a P4M and a mobile celeron. So if it could handle the overclock on a motherboard that supports a 200MHz (800) fsb then the pin mod would work.

Indeed the SIS 648 chipset doesn't support 200Mhz fsb, but the SIS 648FX does support fsb up to 200Mhz (and higher).
But my problem is solved now, as I've discovered the usage of the "safe-mode" jumper on the motherboard. When in safe mode, it allows to acces a menu called "maintenance" in the BIOS in which you can set frenquencies manually (memory/cpu/pci/agp) but not voltage.

That's great. So I put back up the BSEL0 and BSEL1 pins and set bus frequency to 200Mhz in the BIOS. -> Marvellous it works, CPU runs at 2.4Ghz (12x200).
Putted the jumper back to normal mode, and the cpu is still at 2.4Ghz and 30°C idle :cool:

And the funny thing I forgot to tell about this motherboard (or BIOS): the CPU is detected as an Intel Xeon :)

So I confirm, this mother board GA-8s648fxm2 (made for NEC/Packard-Bell) and then probably its sister GA-8S648FXM are compatible with P4-m and no pin-modding are needed.
 

astaflash

Junior Member
May 9, 2006
5
0
0
Originally posted by: robertk2012
Gigabyte GA-8IPE1000G anyone used one of these before?

Non, but I will test the P4-m on a GA-8IK1100 as soon as I get mine back from RMA. :)