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Pentium 4 2.8GHZ showing 1.87GHZ.

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-Processor-2_00-GHz-128K-Cache-400-MHz-FSB

Pentium 4 which i have now- http://ark.intel.com/products/30764/Intel-Pentium-4-Processor-520521-supporting-HT-Technology-%281M-Cache-2_80E-GHz-800-MHz-FSB%29
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-

..
27 answers Last reply Best Answer
More about pentium 8ghz showing 87ghz
  1. 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 :)
  2. 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
  3. 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:
  4. 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-Processor-520521-supporting-HT-Technology-%281M-Cache-2_80E-GHz-800-MHz-FSB%29

    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.
  5. 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..

  6. 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....
  7. The last setting for FSC is wrong :) put it to 2-3 to run 800 fsb
  8. are you pointing to my jumper settings for FSC or of Interocitor?? :fou:

    and sorry for the wrong intel link, i got confused.. :(
  9. Dammit, I missed the diagram that is printed right next to the jumpers :(

    Correan is right.
  10. 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??
  11. 23 12 23 should it be

    have you tried reset bios with these settings ?

    Ram is ok to run all speeds ...
  12. hmm to be all sure FSA 23
    FSB 12
    FSC 23
  13. 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...
  14. Best answer
    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.
  15. Well acording to your mobo the settings should like this
  16. 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
  17. ok, gonna try this one with BIOS reset and hope system will go past windows loading screen.. (23 12 12).
    gonna post result soon..
  18. 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 :)
  19. With that setting you should get 400 mhz ?
  20. 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??
  21. 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..
  22. 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..
  23. 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.
  24. 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:
  25. Best answer selected by hwmgr.
  26. 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.
  27. 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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