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

[ll0zz]

Perfect !
Less than 1v would be great...

I just miss the list of best steppings, and knowing existance - or not - of 9x P4M

 

[TStep]

Any of the C1 or D1 steppings off of this link would likely give you the highest cpu speed at the lowest voltage.

Edit: socket 478 of course. Original link didn't work, so just click "go" on the provided link.

 

[ll0zz]

What a pitty, I find mainly B0s on eBay !
I think I have to be patient...

Thanks a lot for all these useful informations...

 

[Zap]

Originally posted by: ll0zz

Originally posted by: TStep
On the miniQ450: Is it a SIS 651 chipset? Does the motherboard allow you to manipulated the fsb?

Yes and yes, from 100 to 200 by 1Mhz

In fact I hope I can reduce voltage as much as possible, ans I know I can't hope keeping high frequences.
I thought about 100-150fsb, according to the best perf/wattage I can achieve with the chip I will find...
And a 9x would be even better, to have more perfs for the same wattage...

AFAIK P4M will run at 12x mult. I still don't see why you want a lower mult especially with a 651 chipset board. Those don't have AGP/PCI locks and so 140-150 would be highest attainable no matter if you use the integrated video or not.

D0 is a prescott stepping is it not? I am not positive that a 651 will accept that, but someone else may know.

I don't think it is a limitation of the chipset. ASUS "P4SP-MX" SiS651 supports Prescott chips.

 

[ll0zz]

Originally posted by: Zap
AFAIK P4M will run at 12x mult. I still don't see why you want a lower mult especially with a 651 chipset board.

Because I don't need a much powerfull machine (better than Via C3 though), and I want very low electrical power consuming machine. So 12x133 is better than 16x100 for same heat and power consumption.

Those don't have AGP/PCI locks and so 140-150 would be highest attainable no matter if you use the integrated video or not.

Good, I'll see if integrated video is sufficient quality for me...

I don't think it is a limitation of the chipset. ASUS "P4SP-MX" SiS651 supports Prescott chips.

But Prescott sucks according to perf/heat ratio.
I tried P4C 3.0, but it just didn't boot, probably beacause of fsb800. Maybe it would be possible with a pin-modified P4C but the one I tried wasn't mine, so I couldn't pin-modify it.
It would be nice to have HT, but P4C 2.4 are almost twice the price of P4M, and I don't know if they support such low voltages...

Thanks again, those are as rare as usefull informations...

 

[ammarcoux]

Hello all,

I was wondering if any of you have tried a Mobile Celeron with a Intel 845E chipset based motherboard? I have a 1.8Ghz Mobile Celeron (SL6J4) and a MSI 845E Max2-LR and it just doesn't want to POST at all. I tried the bent pin trick and still no go.

Thanks for any info you might have. This post has already given a lot of useful info.

Alexander M.

 

[TStep]

Originally posted by: ammarcoux
I was wondering if any of you have tried a Mobile Celeron with a Intel 845E chipset based motherboard?

Not a mobile Celeron, but the rig I gave to my parents is a P4M on an Abit BG7 (845G chipset). No pin mods necessary what so ever.

 

[ammarcoux]

Hey, check this out! A board that claims it support mobile P4s! It also has ISA slots lol.

http://www.portwell.com/embedded/PEB-7702G2A.htm

 

[TStep]

ammarcoux: just a thought on your no post mobile. Did you check out the contact patch to be sure the hsf is in good contact with the core? Whenever I try a new hsf / motherboard combo, I put a small dab of grease on the core, install the hsf, uninstall and check the contact patch. There should be very little grease left on the core, nearly transparent, if good contact is made. If there is alot left on the core, that indicates poor contact, which is something that would lead to a no post situation.

 

[ammarcoux]

Yeah, the contact is alright but not as much as it should be. I guess its time to make that penny I've been saving into a mean lean copper slug. I'll try it out and see what happens.

 

[ammarcoux]

Hello,
I just finished sanding my penny and used it with the processor. It still won't post. I will try to get a normal celeron or p4 to see if the board will at least post with that. I'm also getting another three p4 motherboard to play with soon so I'll see if the mobile celeron works with those. If your curious what the 3 other boards are here's they're names:

ECS - P4VXMD
ECS - PT800CE-A
ASUS - P4G533-LA

Later

 

[TStep]

Just picked up a mobile Celeron 2.0 C1 (SL6QH). Slapped it on an Asus P4S800 w/ stock Intel hsf w/ raised copper core. Just to get a quick feel for what it could do, I primed it for a few minutes at 3.0ghz (20x150) @ 1.5v. Temps a real nice @ 40C (relative to 24C at idle), hsf a bit loud though.

Notes on the initial boot:
-detected the cpu right off (no pin mod needed)
-booted at 0.875v, 20x100 no problems what so ever at such a low voltage
-rebooting nicely and holding all custom bios setting
-fsb set at 150/38, so I do not think the pci locks are in effect


Edit #1: P4S800@ fsb=150, 512mb Pc2100@150 2.5-3-3-7, Mobile celeron 256k at 3.0 (20x150)
Just ran CPUBench2003, above system at 7153 CPUMarks
Comparison from their database:
-P4 @ 3.00 (fsb=150) 7554 CPUMarks
-P4 @ 3.48 (fsb=178) 8419 CPUMarks
-XP 2800+ (fsb=133) 6732 CPUMarks
-XP @ 2.65 (fsb=230) 8356 CPUMarks

Edit #2: Currently priming away nicely 2.67ghz, 1.3v, 35C (relative to 24C at idle). Fan much more quiet at 1.3v

 

[BigBadBiologist]

Originally posted by: ammarcoux
Hello,
I just finished sanding my penny and used it with the processor. It still won't post. I will try to get a normal celeron or p4 to see if the board will at least post with that. I'm also getting another three p4 motherboard to play with soon so I'll see if the mobile celeron works with those. If your curious what the 3 other boards are here's they're names:

ECS - P4VXMD
ECS - PT800CE-A
ASUS - P4G533-LA

Later

Have you cut/bent over the AE1 pin? 845 mobos tend to support the mobile celerons pretty well because a lot of laptops used the 845 chipset.

 

[TStep]

About 5 posts ^ he said he bent the pin. Hope he got the correct one:Q

 

[BigBadBiologist]

oops. missed that. yeah, confirm that you bent the correct pin (most diagrams are from the top of the CPU).

 

[ammarcoux]

Yeah the right pin is bent. I wonder if the board is dead. It was only $15 even though the person claimed it worked lol. We'll see I guesss. I would really like this to work. The prob the board is having is that the post sequence keeps on going in a loop. I have one of the POST code cards and it keeps on loopin from DD (chipset initialization) and D3 (memory check). I wonder if it need PC1600 RAM to work.

 

[BigBadBiologist]

what kind of RAM is in there now?

 

[ammarcoux]

A Viking DDR PC2700 512MB. I also tried a Samsung DDR PC2100 512MB stick but with the same POST code syndrom as the Viking.

 

[TStep]

Have you tried all the different memory slots w/ one stick only? PC2100 should work in that board.

 

[TStep]

For those interested, add the Soyo SY-P4RC350 board as a nice choice for a quiet HTPC. Slapped an AE1 modded, 133 modded Celeron 1.5 in it this morning. Booted up fine with a cheeseball AOC aluminum cooler w/ 10mm fan (model EC-NW6-715CA).

Ran it for a while at 2.0 (15x133) and 2.2 (15x148) running prime concurently. Relatively quiet, controlled temps reasonably well, although a fan swap to a lower rpm 25mm would be advisable from a sound aspect. The good thing is the cooler is cheap, makes nice core contact, and a fan mod would involve the replacement of the fan and 4 longer screws.

The board is somewhat limited in the oc features. No vCore adjustment, only a 15mhz bump available for the fsb (hence my limit of 148mhz on the fsb), but the onboard graphics are beautiful. Not a tweakers dream, but real nice for a set-it-forget-it setup.

 

[TStep]

Switching back to the P4S800. Slapped in an unmodded Celeron mobile 1.8 C1 SJ6J4. DDR at 1:1, cheesy AOC cooler from above, vCore set to 1.5.

Some real quick testing puts the limit in the 3.1-3.3 range. Backed off to 3.0 so I could bring the agp/pci back in line at 18x166/66/33. Testing right now, but I don't see any problems with this one either running stable at 3Ghz.

Edit: forget to mention that an Abit IC7 Max3 is a no-go for an unmodded Celeron mobile.

 

[greenwar]

Hi guys, Please ignore my stupidity. I just bought two mobile celeron 1.8 C1 stepping I belieave. I was looking at the picture karaktu has put up on the first page of this thread. He mentions that bend or break pin AE1 color coded with white. Looking at the picture, I see two white pins. 1 towards the edge of the chip and one somewhat in the middle(not middle but among the other pins below a yellow pin) . Which one am I supposed to break or bend? I would just have one chance to do this so dont want to screw it up.

Also I am planning to use a ASUS P4P800S mobo. Did anybody have a luck with that mobo?

I would greatly appreciate your replies.

Take it ez.

 

[ammarcoux]

Originally posted by: TStep
Have you tried all the different memory slots w/ one stick only? PC2100 should work in that board.

Yeah unfortunately no go. At least if the POST code stayed at one number it would be easy to diagnose.

 

[ammarcoux]

Originally posted by: greenwar
Hi guys, Please ignore my stupidity. I just bought two mobile celeron 1.8 C1 stepping I belieave. I was looking at the picture karaktu has put up on the first page of this thread. He mentions that bend or break pin AE1 color coded with white. Looking at the picture, I see two white pins. 1 towards the edge of the chip and one somewhat in the middle(not middle but among the other pins below a yellow pin) . Which one am I supposed to break or bend? I would just have one chance to do this so dont want to screw it up.

From what I see on the picture, the white pin is the second down on the left.

I would personally suggest just trying the processor on the board before bending the pin and then bend it if it doesn't go.

Also I am planning to use a ASUS P4P800S mobo. Did anybody have a luck with that mobo?

Nope haven't tried that mobo out but I'm pretty sure it will work since Karaktu mentioned in the orginal post that the P4P800 or P4P800 Deluxe works so I'm guessing the P4P800S is just a variation of the P4P800.

Have fun

 

[Zap]

Karaktu, time to add another board to the list:

Asus P4SP-MX
SiS 651 chipset, mATX, seems to work just like the P4S800-MX but without the locked AGP and the 800MHz FSB support. With no mods to the CPU, just pop it in, set FSB to 133, runs great at "detected" 1.6v.