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increasing FSB with Thunderbird

Discussion in 'AMD Thunderbird' started by Species, Jan 29, 2004.

  1. Species

    Species Guest

    What kind of performance increase would I get if I took my Athlon 850
    from 100x8.5 / 850MHz to 146x6 / 876MHz? I've got Legend CAS3-3-3 SDRAM.
    Species, Jan 29, 2004
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  2. Species

    Wes Newell Guest

    Not enough to notice even if it worked. With a 146Mhz FSB you run into
    concerns for ram speed, PCI and AGP bus speeds. How fast is your ram?
    PC133 is rated only for 133Mhz. I'd just up the multiplier to get more
    speed, or maybe change the FSB to 133MHz as long as I knew the ram would
    work there. 7.5x133 should be doable, or 10x100. May get higher, just
    depends on your components. I had my old 1gig tbird up over 1400MHz.
    Wes Newell, Jan 29, 2004
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  3. Species

    Species Guest

    Hmm okay. Maybe I'll get a ThoroughbredB when they're being given away
    They all cope fine with the PCI at 37MHz. I wonder why components today have
    such trouble with high PCI speeds, when back in the VESA days lots of things
    ran fine at 40 or even 50MHz.
    That's true, but this module is a more recent part and copes pretty well with
    the higher speeds.
    Stupid motherboard doesn't have any multiplier settings :) I'd have to get a
    I've got no doubt the CPU could beat 1GHz, but the motherboard doesn't have
    any vcore adjustment, and it is limited to how far it can go with the

    Asus has got some pretty weird definitions of "easy jumper-free overclocking".
    No vcore nor no multiplier adjustments. How're you meant to overclock easily
    when you can't move anything other than the FSB? :) I think Asus is

    That's pretty good. Maybe you could run it at 22x110FSB? ;)

    It is good to see you didn't simply chuck out your motherboard like most
    people would when they get a new CPU.
    Species, Jan 29, 2004
  4. Species

    Wes Newell Guest

    You can change vcore and or multiplier using the pinmod. Just a little

    Wes Newell, Jan 30, 2004
  5. Species

    Species Guest

    Species, Jan 30, 2004
  6. Species

    Wes Newell Guest

    The vcore pinmod would be the same. And all but the 5th multiplier bit
    (pin AJ27) would be the same. You probably could connect it as it's not
    used on the Tbird. For vcore, you actually only need to add 1 wire to set
    the .1v bit to get it up to 1.85v. And normally you won't ned all 4 wires
    to set the multiplier you want either, although it may be easier than
    figuring out which ones you do need. This can also be accomplished on the
    cpu itself if you want to take that route. Or you could wire up jumper
    blocks/switches to the back of the MB if you want easier ways to change
    all this. Options are many. As an example, let's say you want to test with
    1.85v. you could wire up a spst or spdt switch to the .1v control pin and
    then turn it off and on without having to take out the cpu. Many many ways
    to skin a cat.
    Wes Newell, Jan 30, 2004
  7. Species

    Species Guest

    does the CPU have to be unlocked before the pin mod will work?
    Species, Feb 3, 2004
  8. Species

    Wes Newell Guest

    For the multiplier, yes. Not for vcore.
    Wes Newell, Feb 3, 2004
  9. Species

    Species Guest

    That'd be done by cutting the L1 bridges wouldn't it? I think I'll set a
    6.5x or 7x multiplier.

    I read that POSTing can be problematic when running it with the 133MHz+
    bus, as it uses the original (8.5x) multiplier momentarily, is this
    Species, Feb 4, 2004
  10. Species

    Wes Newell Guest

    No. The L1 bridges are not cut on unlocked cpu's. All Palomino core cpu's
    had them cut and you had to reconnect them to unlock the cpu. L1'a are not
    cut on Tbreds/Bartons, but newer cpu's are locked another way internally
    and the condiditon of the L1's doesn't matter.
    Depends on Mb. Only a very small amount of boards have this problem afaik.
    And pressing reset does boot the system.
    Wes Newell, Feb 4, 2004
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