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Pentium 4 / 2,8GHz running only at 2,1GHz

Hello, any help on this issue would be great! My system is based on a ECS P4S5A/DX Motherboard (Socket 478) and a Pentium 4 / 1,8 GHZ processor. I found another better one to replace the processor, the Pentium 4 / 2,8 GHz. Everything works fine, but the new processor runns at 2,1 GHz and not at its full speed ( It says 21 * 100 ). From the BIOS setup i can not change neither the multiplier 21 (which i expected) nor the FSB value of 100. How can i make the processor to work at its normal speed?? Thanks a lot in advance!
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More about pentium 8ghz running 1ghz
  1. This is the processor

    and also after a test with this programm it runs at nearly 2,8

    but i cannot keep these settings.

    What else can i do?? Thanks!! :hello:
  2. First check your mobo CPU support list from their website. You may need to update you BIOS, or you may be stuck. Next try to change the FSB in your BIOS. Look for an "advanced", or "CPU" or "Chipset" option.
  3. This is kinda normal as far as I know, for example on my e7300, the frequency changes depending on how much load the cpu is having to process. So yeah IMO nothing to worry about.

    What I suggest you to do is run it under full load and check the speed again, it should now be at full.
  4. Best answer
    Welcome to the forums!

    P4S5A/DX+ - ECS Elitegroup

    Socket 478 board that supports Intel® Pentium® 4 processor up to 533MHz FSB

    533/4=133 MHZ max.

    The manual at page 14 says:

    This mainboard automatically determines the CPU clock frequency and system
    bus frequency for the processor. You may be able to change these
    settings by making changes to jumpers on the mainboard, or changing the
    settings in the system Setup Utility.

    The processor is supported:

    The manual does not explain which jumper to change.
  5. Thanks a lot folks for your time and awnsers!!

    Actually, i found where in the BIOS the value from 100 to 133 could be changed, it was togerher with the RAM frequency!!

    So it was a bit of a frustrating question, but thanks a lot again!!!

    I'll try also to awnser some questions here if i know something, cuase there forums are really helpfull!
  6. Best answer selected by aquadelta.
  7. This topic has been closed by Mousemonkey
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