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Thread: Increase FSB or CPU Multiplier

  1. #1
    Join Date
    Jun 2009
    Posts
    5

    Increase FSB or CPU Multiplier

    hi ,
    i have started overclocking but terms FSB and Multiplier is just confusing to me is that need to increase FSB with low level CPU Multiplier also how to set SetFSB command line in order to increase the FSB ? please help me regarding
    thank you.

  2. #2
    Join Date
    Aug 2007
    Posts
    1,098

    Re: Increase FSB or CPU Multiplier

    You can use SetFSB. SetFSB allows to change your computer's Front Side Bus (FSB) speed.

    List of supported board, please see Authors homepage for more details if needed:

    Intel
    440BX
    8xx
    9xx
    G33/P35/X38/X58
    5000X/5400X
    US15W

    ATI
    Xpress 3200 Intel
    Xpress X1200 [RS690M]
    RADEON IGP320
    RADEON IGP350[ALI M1533]

    AMD
    AMD-760(VIA VT82C686/A/B)

    VIA
    KT266 - 600
    K8T800(Pro)
    Pro133(A/T)
    Pro266
    PT880Ultra
    VN800
    VX700

    SiS
    SiS645
    SiS649
    SiS651
    SiS661
    SiS662
    SiS740
    SiS746
    SiS748
    SiS756
    SiS761GX

    ULi
    M1695[M1567]

    I like that setup SetFSB: "SetFSB.exe / autoinc / step: 2 / period: 60"
    SetFSB start, and every hour, FSB increase.

    If my FSB set to 300MHz at H 0, it will be:
    - 1 H: 302 MHz
    - M 2: 304 MHz
    - 3 H: 306 MHz
    ....
    - 10 H: 320 MHz

    Example, I want to increase my FSB automaticlly every 5 minutes by step of 10 MHz:
    "SetFSB.exe / autoinc / step: 5 / period: 10"

    In my examples, self SetFSB increase FSB but never stop alone. Maybe we need to add a last option:
    "SetFSB.exe / autoinc / step: 2 / period: 60 / maxstep: 10"

    maxstep: 10: Number of steps that SetFSB can do. SetFSB When do all steps, it stop the auto increment.

  3. #3
    Join Date
    May 2008
    Posts
    666

    Re: Increase FSB or CPU Multiplier

    Command Line Switch Options SetFSB Version 2.0.b.20c has the following Command Line Switch Options.
    -w [00-99]: Wait [sec] default = 10sec
    -s [000-999]: Set FSB [MHz]
    -i [00-99]: Increment [MHz] default = max
    -u [00-99]: 0 (default) = normal, 1 = high
    -b [0-1]: 0 (default) = normal, 1 = background

    [/ H60]-h [00-99]: hold [min.]

    -S300 / S300 This works both.

  4. #4
    Join Date
    Sep 2005
    Posts
    1,434

    Re: Increase FSB or CPU Multiplier

    CPU operation speed = FSB frequency x CPU multiplier , Users tweak their systems either by increasing FSB frequency or CPU multiplier, which is usually locked for the Pentium 4 CPU when purchased of the shelf, greatly limiting your overclocking options.I have a amd athlon xp 1800 Palomino core on a Giga-Byte 7DXR has a maximum FSB of 150 and a multiplier of up to 12.5 last I look up 12.5x150 = 1875 Mhz. Suppose I have a amd athlon 2100 or 2200 purchase this work according to me in 1770 and 1800 Mhz

  5. #5
    Join Date
    Oct 2005
    Posts
    1,217

    Re: Increase FSB or CPU Multiplier

    your motherboard has a maximum number of mHz stable turns. The multiplier is determined by the processor. So I get the maximum multiplier of 12.5 is not quite.

    2100 + (1733) and 2200 + (1800) works both with 133 FSB so mp of 13 or 13.5. They are unlocked (= you can change the multiplier) so you can easily clock.

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