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800 or 512 FSB in 400 FSB mobo work?

By p356
Sep 18, 2007
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  1. I've got an Intel D845WN, that has 400 FSB, Intel P4 1.6 Ghz ship in it. Would like a cheap upgrade, like $50 for a P4 2.5 Ghz CPU, but the ones I see out there are 512 or 800 FSB. Anyone tried this in this motherboard, and will I get 2.6 GHz?
  2. Fragrant Coit

    Fragrant Coit TechSpot Maniac Posts: 579

  3. LinkedKube

    LinkedKube TechSpot Project Baby Posts: 4,265   +41

    if its possible the only think you might be able to do is change the multiplier. Which the multiplier on that is x4, hence 400fsbx4=1600mhz. Say if you were to change the multiplier to 6, it would be 400x6=2400mhz. But I dont know a whole lot about old p4s, if you can change the multiplier but you can check in the bios though.
  4. Fragrant Coit

    Fragrant Coit TechSpot Maniac Posts: 579

    Correct me if I'm wrong... but I don't think it'll even POST with an 800 {or 512) MHz CPU, so it'd be difficult to change the Multi!!!!

    You are probably better saving a bit of cash and getting a cheap Core2 - like an E2160, board & RAM. That'd eat the old P4 for breakfast.

    You could always source a used 'board + 800FSB CPU {don't get a Celeron! get the "proper" P4}, but I'm seeing a lot of failing P4 S478 motherboards at work at the moment, so it'd be a bit of a gamble.
  5. p356

    p356 Newcomer, in training Topic Starter

    Thanks for the advice. I think I'll keep it cheap-ish and just get exactly what Intel says to get bus-wise. Can't justify spending much (to get the next generation of good stuff) as I've used up my "spending money on myself" credits with my wife! Looked in to 2.5 P4 Pentium.
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