Underclocked Pentium 4 Problem

I had a Dell Dimension 2400 with a Intel Celeron Processor that ran at 2.6 GHz.
After acquiring a computer from a friend, which had it's PSU burned out.

I salvaged some parts, one of which was a Pentium 4 2.8 GHz. I thought I could get better performance from it than my Celeron, and my PC's owner manual said it could accept ether a Celeron or a Pentium 4 CPU. So installed it, enabled Hyper-Threading and had to reactivate Windows XP "because of a significant hardware change".

Long story put short, I can only find my CPU's clock speed to be 1.4 GHz, not the labeled 2.8 GHz. Now I wonder if its possible to get 2.8 GHz, or would my old Celeron have better performace than this 1.4 GHz Pentium 4. Any help or information would be appreciated.
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More about underclocked pentium problem
  1. It may run slower because it isn't supported. Is the P4 533 MHz FSB?
  2. No the P4 is 800 MHz FSB.
  3. Best answer
    Zraster said:
    No the P4 is 800 MHz FSB.

    That's why the FSB is dropped to 400MHz. Get a supported 533MHz FSB CPU and it will run at its rated speed.
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