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

[nickdigger]

what's your S-code? maybe it's a fixed multiplier.

 

[lecep]

drapal

 

[DanU]

Another success! I have a mobile celeron 2.2GHz running at 3015GHz (137MHz FSB) on an Asus P4SGX-MX. It's an SIS 650GX motherboard. No mods were needed. I just dropped it right in and the core voltage is reading 1.63V. I'm using DDR400 ram and it's taking the 411MHz clock just fine. I'm quite surprised at this since officially the motherboard only supports up to DDR333, but there is a DDR400 setting in the BIOS.

 

[Zap]

WTG, DanU! :thumbsup:

BTW, just an update to an earlier post... my P4S8X-MX still says invalid microcode, but I just set BIOS to not halt on any error, and it boots up fine. Also, someday I may revisit that board and find out once and for all if it is the BSEL mod or the volt mod that causes it to misbehave - no POST after clearing BIOS. I can live with 1.60v+ if I can use over 150MHz FSB, so I'm crossing my fingers... theoretically the BSEL should be fine.

 

[lecep]

any news about p4mobile mod ?
i have buy a p4m 3.06 and i wait to know to use this one on my p4p800 de luxe..

 

[osage]

Originally posted by: Zap

Originally posted by: daclayman
On the motherboards, the Abit IS7-E2 does work with mobile P4s. There is a BIOS setting in advanced which has to do with FSB that needs to changed to 800. I couldn't get a post at 140FSB or higher with it not set to 800 (I'll elaborate and edit after I go get some :beer::beer.

Are you talking about something listed as "FSB bootstrap" that lets you set 400/533/667/800?

PIV mobile ? I got one and I cant even get it to run at its rated 3.06ghz speed. Fastest it will POST at is 2.4ghz. I'm using an ABit IC-7G (intel 875 chipset mobo) I know the multiplier is locked at 12X. Is there a way of getting the multiplier upto the high mode - 23X. I wonder if there is a pin mod ?

You're stuck at 12x mutliplier on a desktop board, but you should be able to go higher than 2.4GHz because I'm sure many people have gotten the Abit IC7G to 250MHz FSB and higher, meaning you can get 3GHz. Change "FSB strap" to 800, reduce your memory multiplier and let 'er rip!

lecep, you will be stuck with a 12 multi

 

[Hacp]

Question. How do you do the volt mod to 1.6? Do you just stick a peice of wire in the holes where the two pins are located? Something like a thin paper clip? Anyone?

 

[lecep]

thank, i wait for some news like a p4 cel mobile mod

 

[Zap]

Most boards detect the mobile Celerons at 1.6v automatically. Modding it is to lower the voltage.

 

[Gusbf]

I have bought this cpu (SL6VB) 2.2 Ghz Mobil pentium 4 M with the purpose of breaking the pin and run it a FSB=200

The problem is just that after that I broke the BSEL1 pin it will not post.

Is there anything that I have missed about configuration of bios?

The only thing I have done is breaking the pin and tried it out on my motherboard.
My motherboard is an Asus P4GLP-X.

 

[littlalex]

Can't find any reference to that MOBO on Austek website. You sure it supports 200 MHz FSB?!

Littlalex

 

[Gusbf]

Ahh, my mistake. Its a P4GPL-X motherboard and NOT a P5GLP-X.

Thanks for the quick respond. In the manual it is said that "Front Side Bus : 533 MHz 800 MHz".

I refer to: http://www.api.de/db3/pdfart/23564.pdf

I should be ok, shouldn't it?

 

[Zap]

It should be okay, but... did you test the CPU before breaking the pin?

 

[Gusbf]

Yes, because I bought i 2.hand I tested it and it posted 12+100 = 1.2 Ghz. It ran a bit hot but I dont think that I have burned it because it has a max temperatur of 100C.

I have just read the first page in this topic where it is said "The pin highlighted in light blue is the 200FSB pin. I don't recommend messing with this pin unless you're absolutely certain your CPU does 200FSB (likely on a 1.5GHz CPU, very possible on a 1.6GHz CPU, but probably not going to happen above that without extreme voltage"

Is that my problem? My CPU is 2.2 Ghz

 

[rogue1979]

Originally posted by: Gusbf
Yes, because I bought i 2.hand I tested it and it posted 12+100 = 1.2 Ghz. It ran a bit hot but I dont think that I have burned it because it has a max temperatur of 100C.

I have just read the first page in this topic where it is said "The pin highlighted in light blue is the 200FSB pin. I don't recommend messing with this pin unless you're absolutely certain your CPU does 200FSB (likely on a 1.5GHz CPU, very possible on a 1.6GHz CPU, but probably not going to happen above that without extreme voltage"

Is that my problem? My CPU is 2.2 Ghz

If it is a mobile P4 then it will default to a 12x multiplier. 12 x 200 for 2.4GHz should be very easy for that cpu.

 

[Gusbf]

It is a Mobile Pentium 4 M processor 2.2Ghz that I have bought.

Was just wondering if there is something that I have missed during the "operation".

Stage 1: Test the CPU before breaking anything. The system post and booted the windows fine. Speed was 12+100 = 1.2Ghz. It went a bit hot (80 Celcious), but I closed windows and went on with stage 2.

Stage 2: Breaking the Bsel1-pin. Third from above and fifth row (the picture on post 1). The metode to break it was to rock it forward and backward until I broke.

Stage 3: Putting it on my Asus P4GPL-X motherboard with a Zalman 7000-cu. The system wouldn't post at all. The screen was just black.

Stage 4: Installed my old Pentium M 1.6 Ghz and thats the story so far..

Stage 5: What to do ??? Have I missed something important for instance setting the volt to a specific number before switching CPU? I really dont know what to do. I in fact bougth a second Mobile P4-M 1.8 CPU that I might use if I dont figure out the problem with the first one.

Help Needed..

 

[Gusbf]

I was wondering if it is the BSEL1 pin or the BSEL0 pin that I have to break. I have broken the BSEL1 pin to make the FSB run at 200. Should I instead have broken the BSEL0 pin?

Is it possible to break both?

 

[rogue1979]

I'm not sure, it is hard to remember back. But one thing is for sure, you cpu temp is way too hot. At only 1200MHz it shouldn't be above 35c. Remember, there is no heat spreader on the Pentium 4M. I think if you put more grease on the cpu and and install the heatsink after you clean it with alcohol, you may notice something. Look at the bottom of the freshly installed heatsink before you turn on the PC, it is possible the core is not making good or any contact with the bottom of the heatsink.

 

[Gusbf]

Thanks for your reply about the heatsink. I know that the temperature is a bit hot a 1.2Ghz. I do in fact think that I did use another heatsink than Zalman 7000. Maybe it didn't make a good contact with the cpu.

 

[Zap]

If it was 80ºC at 1.2GHz and you bumped it to 2.4GHz... I'm thinking heat related.

 

[Gusbf]

I have only used the "bad" heatsink when I tried 1.2Ghz. After breaking then pin I had bought a Zalman 7000-cu.

 

[bullgatesJR]

Hi All,

Question for the members that mod'd P4-M cpu. I have this CPU:

http://www.cpu-world.com/sspec/SL/SL6F9.html


and was wondering if this cpu can be mod'd to fit in a Socket 478 board. The cpu doesn't fit in the 478 slot on the board so was wondering if it is a waste of time to try the mod. I have this board :

http://www.ocworkbench.com/2002/gigabyte/8inxp/8inxpp1.htm

Any input is greatly appreciated.

Thanks.

 

[Zap]

AFAIK there is no way to get a Pentium M to work on that Gigabyte board. It IS possible to get that Pentium M to work on some Asus socket 478 boards. For it to work you'd have to buy the CT479 adaptor (around $50), have the supported board and update to the newest BIOS before installing.

 

[bullgatesJR]

I caught it too late that it was a 479 pin cpu even though it is advertised as a 478 pin cpu. Or at the very least it is advertised as both. 478 pin FCPGA vs MPGA.

Thanks for the reply. Thought it was going to be that Asus answer.

 

[jazzisjazz]

Need a quick opinion

which is better a c4 2.9ghz @ 645fsb or a c4 3.2ghz @ 533 or c4 3.0 @ 800fsb? assuming all are stable with reasonable voltages ?