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Pentium 4 2.8GHZ showing 1.87GHZ.

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May 26, 2012 10:01:47 AM

I recently removed a celeron 2.0GHZ from my mobo and installed this 2.8ghz pentium 4..

Mobo- Zebronics ZX-945-15 (i915 chipset, which says to support 400/533/800mhz fsb as in the manual..) with 1gb ddr2..

Celeron which i had- http://ark.intel.com/products/27174/Intel-Celeron-Proce...

Pentium 4 which i have now- http://ark.intel.com/products/30764/Intel-Pentium-4-Pro...
Problem is that my celeron used to run @ 2.66GHZ with 20x multiplier.. (20*(533/4))...
But this pentium 4 is only running @1.87GHZ with 14x multiplier.. (14*(533/4))...
BIOS detects it as Intel(R) Pentium(R) 4 CPU 2.8GHZ
Tried testing speed with high usage (wPrime benchmark) but it did'nt overclock..

I have explored the bios and could'nt find any setting about multiplier or voltage adjustment..
Is there any way to increase this multiplier.. Any wire mod or something like jumper settings..

CPU-Z Log-

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a b à CPUs
May 26, 2012 11:05:57 AM

Bus Speed is 200 Mhz for the cpu to run at 2.8 ghz

When it only run at 133 the speed is 1.866 ghz

So find on your board where you can change the Bus Speed :) 
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a b à CPUs
May 26, 2012 11:15:53 AM

Forget my other post :) 

You need to change multiplier to 21 for the Cpu to run 2.8 Ghz - look where it says cpu

- and disable any power saving features - allso in windows - check power features

in control panel and run cpu on full power
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May 26, 2012 11:29:12 AM

correon said:
Forget my other post :) 

You need to change multiplier to 21 for the Cpu to run 2.8 Ghz - look where it says cpu

- and disable any power saving features - allso in windows - check power features

in control panel and run cpu on full power


I can't figure it out in bios, can you.. ??
Here's how my bios looks like:

In CPU:



In Chipset:



In Power:
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Anonymous
May 26, 2012 11:55:13 AM

The Intel link for the P4 is not correct.

The only 2.8GHz P4 HT with 1MB L2 for Socket 478 is this one:
http://ark.intel.com/products/30764/Intel-Pentium-4-Pro...

Looks like you are stuck with the 14x multiplier. You need a 200MHz bus speed to get 2.8GHz.

EDIT: I would try to raise the DRAM frequency to 800MHz. Maybe that will have an effect on the FSB? I can't find ANY information about that motherboard.
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May 26, 2012 12:07:28 PM

Can you tell me how to increase bus speed?
I tried jumper settings, but this is the best i can get..
Here's a look at my jumpers..

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Anonymous
May 26, 2012 12:15:53 PM

Found this on the forums:


ic36reak3r 07-22-2010 at 04:40:27 PM

Left to right...123.

FSA = 1-2
FSB = 2-3
FSC = 2-3

punches the system to 800 MT/s

Try it....
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a b à CPUs
May 26, 2012 12:17:24 PM

The last setting for FSC is wrong :)  put it to 2-3 to run 800 fsb
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May 26, 2012 12:21:24 PM

are you pointing to my jumper settings for FSC or of Interocitor?? :fou: 

and sorry for the wrong intel link, i got confused.. :( 
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Anonymous
May 26, 2012 12:33:52 PM

Dammit, I missed the diagram that is printed right next to the jumpers :( 

Correan is right.
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May 26, 2012 12:48:36 PM

ok, i tried every combination possible, and here are the results..
These are from Left to Right according to the diagram... (FSB, FSA, FSC)

12 23 12 Default (in the diagram), where it's 533mhz fsb.

12 23 23 The one you preferred, and now CPU-Z shows 400mhz FSB, 100mhz Bus Speed, so now processor is at 1.4GHZ.. :heink: 

12 12 23 System Won't Start.

12 12 12 System Won't Start.

23 12 23 System Won't Start.

23 12 12 System will go to WinXP loading screen and then restarts..

23 23 12 System Won't Start.

23 23 23 System Won't Start.

Now what to do??
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a b à CPUs
May 26, 2012 12:56:38 PM

23 12 23 should it be

have you tried reset bios with these settings ?

Ram is ok to run all speeds ...
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a b à CPUs
May 26, 2012 12:58:17 PM

hmm to be all sure FSA 23
FSB 12
FSC 23

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May 26, 2012 1:12:15 PM

correon said:
hmm to be all sure FSA 23
FSB 12
FSC 23



U sure??

acc to the diagram FSA is in middle, so it should be
12 23 23..

And above you say 23 12 23..

Tell me acc to the diagram...
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Best solution

Anonymous
May 26, 2012 1:15:05 PM

Hmm, if 533MT/s is 12 23 12
then 800 MT/s should be 23 12 12.
Maybe set the FSB then load defaults in BIOS or clear the CMOS before booting.
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a b à CPUs
May 26, 2012 1:15:22 PM

Well acording to your mobo the settings should like this
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a b à CPUs
May 26, 2012 1:20:35 PM

400 mhz bus is

FSA 12
FSB 23
FSC 12

533 mhz bus is

FSA 12
FSB 23
FSC 23

800 mhz bus is

FSA 23
FSB 12
FSC 23
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May 26, 2012 1:20:48 PM

ok, gonna try this one with BIOS reset and hope system will go past windows loading screen.. (23 12 12).
gonna post result soon..
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a b à CPUs
May 26, 2012 1:24:36 PM

I look on how it´s printed on mobo not how the diffrent jumpers are placed on mobo

and i have written every jumper name and the setting :) 
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a b à CPUs
May 26, 2012 1:49:30 PM

With that setting you should get 400 mhz ?
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May 26, 2012 2:20:48 PM

Ok, the results are pretty weird..
Firstly i wanna thank you both, correon and interocitor, the settings worked after resetting BIOS...
But then when i was just about to write this reply, a BSOD appears and PC restarts...
Then i tried enabling hyperthreading and PC won't go beyond loading screen...
I opened the case to change again and whamm, CPU was boiling like hell, now running @ 533mhz default setting and it's functioning normally...
I think cooling is not sufficient as i am using my celeron's heatsink and fan assembly, which was a Northwood core..
I have read that prescotts notoriously get much more heated up during operation than Northwoods..
So, do i have to change my fan & heatsink??
Can you suggest some fan for prescott??
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a b à CPUs
May 26, 2012 2:31:20 PM

Yes and they are known as "Presshot" - well the cpu can throttle down if getting too hot or not sufficient cooling - hmm i think only place to look is Ebay "places" and other online action houses..
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May 26, 2012 2:50:55 PM

correon said:
Yes and they are known as "Presshot" - well the cpu can throttle down if getting too hot or not sufficient cooling - hmm i think only place to look is Ebay "places" and other online action houses..


can you suggest some??
Searched on Ebay but don't know what can keep these 'presshots' cool..
Coolermaster looks ok but seems to be more expensive than the processor itself.. :p 
don't know about other brands..
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Anonymous
May 26, 2012 2:59:50 PM

Did you use a thermal grease!?
They don't include socket 478 support in modern coolers. The Zalman CNPS7700 for 478 should be more than enough.

EDIT: Or the Zalman CNPS7500 for 478.
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May 26, 2012 8:27:39 PM

Well, this heatsink has a layer of thermal grease on it, but going to apply a new one...
If does'nt work, then'll look at these fan options too...

Thnx for the help... :wahoo: 
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May 26, 2012 8:28:02 PM

Best answer selected by hwmgr.
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Anonymous
May 26, 2012 8:49:29 PM

I just remembered that the vcore voltage in those screenshots is 1.651. I thought CPU-Z was misreporting those values but since you mentioned heat problems...
The Intel specified voltage range for this processor is 1.287V-1.4V. It seems that the CPU is overvolted.
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May 27, 2012 9:43:53 AM

overvolted??? :o 

How to make it in normal zone to 1.4V?
You have my bios settings above, pls tell me how?
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