celeron 500 ==> o/c - Page 2
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Thread: celeron 500 ==> o/c

  1. #16
    Join Date
    Jan 2000
    Location
    London, England
    Posts
    88
    The PCI bus is made to run at 33Mhz and AGP at 66Mhz. The m/board creates this frequency by applying a division on the CPU speed. Hence when CPU is at 66Mhz bus (celerons) the m/board applies a 1/2 division to create 33Mhz and 1/1 for 66Mhz. When the CPU is at 100Mhz (anything else) the division is 1/3 to create 33mhz and 2/3 for 66Mhz. Therefore when you overclock your CPU bus to 83Mhz the division is still either 1/2 or 1/3 for PCI and 1/1 or 2/3 for AGP.

    If my BIOS only allows me to set 1/2 PCI for 83 then the PCI bus will be at 41.5Mhz which is therefore overclocking everything that is on my PCI bus i.e. cards.

    In the BE6-2 the 1/3 PCI option does not work (even though you can change) until around 92Mhz CPU bus.

    This is exactly the reason defrag screwed up your windows.
    www.seven-internet.co.uk
    Pokemon love to overclock

  2. #17
    Join Date
    Feb 2000
    Posts
    48
    hey duck

    thanks for the awesome explanation...
    but then again (i love ask'n ?'s)
    so why did defrag crash when my bus speed was at 83 mhz
    and why does b6 only work with 1/3 for pci at 93mhz fbs..??

    so many ?s so little time

    hope u don't mind
    thanks

  3. #18
    Join Date
    Jul 1999
    Location
    Stavanger, Norway
    Posts
    1,808
    anangia:

    "so why did defrag crash when my bus speed was at 83 mhz
    and why does b6 only work with 1/3 for pci at 93mhz fbs..??"

    It crash because the PCI-speed is too high, your harddrive simply cant keep up with it.
    As psyduck said, when you overclock your CPU bus to 83Mhz the division is still either 1/2 or 1/3 for PCI and 1/1 or 2/3 for AGP, leaving you with a PCI-speed at 41,5..

    Now, I have the BE6 II myself and have the ability to set the divider to 1/3 at 83 MHz. Why that doesn't work on your board I really don't know. It could be the BIOS, so my suggestion is to look for a BIOS-upgrade.

    Hope this helps!

    Duckman


    ------------------
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  4. #19
    Join Date
    Dec 1999
    Location
    Lechlade
    Posts
    125
    i agree duckman ,
    i also have the BE6-2 and i can use the 1/3 divider at what ever speed i want! i can even use the 1/4 divider.
    i have got to say this board is =one of the most stable i've ever seen!i am only 66mhz behind duckman with his setup and i'm only using air!!I WILL CATCH YOU DUCKMAN!!!!just lend me your water cooler

    ------------------
    ask not what you can do for your computer...
    more what your
    computer can do for you. *Hint Hint*

  5. #20
    Join Date
    Feb 2000
    Location
    Chandler, AZ
    Posts
    266
    I have my 433 Celly at 546 on my abit be6-2. The pci bus is 84. I have it set at 1/3 pci and 2/3 agp just to be cautious. I hope it really is working at 1/3 and not just telling me it is... How do I check on this. Because if it is not at 1/3 and really running at 1/2 then I might be killing my Hard drive. THanks

    Jared
    Finally got the 600e and the Global win VOS32. Now I need some good ram...

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