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Thread: Multi Vs FSB




  1. #1

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    I did a search on this and it brought a lot and I mean a lot of results but the ones I looked at weren't really speific enough. Ok here's my question. My AMD system seems to crash at around the same point during the overclocking progress. I.e Multi @12.5 FSB @ 150 = 1.8 ish it crashes too desktop or Multi @12 FSB @ 154 = 1.8 ish. I except that there are certain things limiting my overclock. I.e my unbranded 300w PSU and my Unbranded 333 memory. Until I can upgrade these this is it for now (AGP Locked) However what I was wondering was, is better to have a lower FSB with a higher multi or a lower multi with a higher FSB? I'm guessing a lower multi with a higher FSB but what do you guys think? :confused: :?:

  2. #2
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    Have ya tried 11/11.5/12/12.5 x 166MHz? :?:

  3. #3

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    No I haven't tried those settings. I think at 155 my PC refused to boot. I expect with a lower multi it will but with it 12.5 with a FSB of 166 I expect it would die.

  4. #4
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    sounds to me like your memory is holding you back...I would up the multiplier and keep the FSB down in that case
    I've gone too far and need to move on!

  5. #5
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    Still DDR333 should be good enough for a 166MHz FSB unless ya PSU is holdin' ya back.

  6. #6
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    lol, I must have skipped right over the 333 in "Unbranded 333 memory"...woops :o
    I've gone too far and need to move on!

  7. #7
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    There can be a lot of reasons that you're stopping there, but Wiggo is right about trying the 166MHz FSB setting. Even if your AGP is locked at 66MHz, your PCI channels are not. When you raise the FSB that high. you're throwing the PCI peripherals out of spec by a fair margin. As long as the mainboard supports the 166MHz standard (like your nForce2 based one), it will kick in with a different ratio when you enable the 166 settings. This will let you know for sure if the memory is holding you back, or the PSU or one of the peripherals.
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  8. #8
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    It can't hurt to try the straight up 166MHz FSB on a reduced multiplier so give it a go. :devil win

  9. #9
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    As to your 1st ? :
    From what I have learned you would want a lower multi and a higher FSB to achieve a "better" OC.

    The reasons for this can be different, or come from different perspectives. Mine has to do with the cpu's main problem of not filling clock cycles with prefect from cache and needing memory to fill the gap, the fastest way possible.
    I just read a huge article on it and it seems this might be the "hold-up" of the faster chipsets coming out. Although they are also looking into upping the on chip cache quite high to eliminate some of this.

    I think Wiggo gave you a good idea with dropping the multi down and at least getting your ram to 166 and going from there.

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  10. #10

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    I've got it at 157*12.5 at the mo. That 1.9 give or take. Seems to be stable at the moment. I think having a lower multi and a higher FSB is better.

    I don't have any PCI componets in it at the mo. I'm using the onboard Lan and Sound. Its good enough for me. :thumb:

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