Is it ok to use an unsupported CPU?

By orondf
Sep 27, 2010
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  1. Hi,
    I have an Asus P4B533 M/B (Socket 478, 533Mhz FSB), and I'm wondering if I can use an Intel Pentium 4 2.60C(S478) with it, which has 800Mhz FSB, and my M/B supports 533Mhz.
    I should be able to overclock the FSB, and use 400Mhz RAM, but the CPU isn't listed in the CPU support list on Is it possible to use that CPU on my M/B?
  2. JMMD

    JMMD TechSpot Chancellor Posts: 854

    If it doesn't power on then you have your answer.
  3. B00kWyrm

    B00kWyrm TechSpot Paladin Posts: 1,436   +37

    Unless I misread the information at ASUS, re: P4B533 you are covered.
    At most you might need a bios update.

    Per Asus:

  4. orondf

    orondf TS Booster Topic Starter Posts: 88

    There are like 3 revisions of that cpu, 2.60 is listed but not 2.60C.
    I have BIOS 1015.
  5. B00kWyrm

    B00kWyrm TechSpot Paladin Posts: 1,436   +37

    Well... since finding a different board for that cpu may be more difficult, I am with JMMD.
    What would it hurt to try? Looks like your BIOS should already be as good as is possible.
    You may need to underclock your cpu, even as you overclock the bus...
    might take some experimenting to find the best settings.
    Have fun.
  6. orondf

    orondf TS Booster Topic Starter Posts: 88

    Thanks for the help.
  7. orondf

    orondf TS Booster Topic Starter Posts: 88

    Swapped CPUs today, works fine. The only problem is that when I boot at 200Mhz BCLK I get beeps for no DRAM installed. Maybe the reason is that the M/B only supports timings of up to 2.5-3-3-7 and the RAM is rated for 2.5-3-3-8.
    Maybe installing beta(!) BIOS 1015.003 (the newest) will solve this?

    Update: Got BSOD 0x8E with 160Mhz BCLK and 2.5-3-3-7 RAM timings. Setting the timings to [By SPD] sets them to 2.5-2-2-6.
    Will setting them to [By SPD] or maybe 2.5-2-2-7 fix the problem?
    DRAM voltage can be set to 2.6V, 2.7V and 2.9V, RAM is rated for 2.5V. Will increasing the voltage solve this?
    What should I set the timings and DRAM voltage to?

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