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HowTo: 3:4 mem ratio above 132fsb on a P4B266

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  • HowTo: 3:4 mem ratio above 132fsb on a P4B266

    please read along carefully.
    this works on any Asus P4B266 series board but you will need to enable jumper mode.

    INSTRUCTIONS
    1) go into bios and set a 132fsb 3:4 mem ratio, save and exit then shut down your system.
    2) enable the jumper mode jumper.
    3) setup the onboard dip switches for your desired speed. (see chart below)
    4) enable the vcore overvolt jumper if needed.
    5) bootup and you will have a locked 3:4 ratio. HOWEVER, if you go into your bios and change/save the config for any reason, you will lose the 3:4 ratio and have to do this again.


    NOTES:
    * Manual Cas settings are disabled above 290DDR and locked @ Cas 2.5/3/3/7.
    * Vcore adjustments are also locked out in bios.
    * the overvolt jumper should give an extra 0.1v to the CPU (1.65v idle)
    * vdimm voltage is a jumper on the motherboard
    * Turbo modes still work.


    P4B266 DIPSWITCH CHART
    5 - 6 - 7 - 8 - 9

    OFF ON ON ON OFF = 180 FSB
    ON OFF ON ON OFF = 170 FSB
    ON OFF ON ON ON = 170 FSB
    OFF OFF ON ON ON = 160 FSB
    ON ON OFF ON ON = 155 FSB
    OFF ON OFF ON ON = 150 FSB
    ON OFF OFF ON ON = 145 FSB
    OFF OFF OFF ON ON = 143 FSB
    ON ON ON OFF ON = 141 FSB
    OFF ON ON OFF ON = 139 FSB
    ON OFF ON OFF ON = 137 FSB
    OFF OFF ON OFF ON = 135 FSB
    ON OFF OFF OFF ON = 133 FSB 66/33
    OFF OFF OFF OFF ON = 133 FSB
    OFF OFF ON ON OFF = 133 FSB
    ON ON OFF ON OFF = 130 FSB
    OFF ON OFF ON OFF = 127 FSB
    ON ON OFF OFF ON = 125 FSB
    OFF ON OFF OFF ON = 120 FSB 60/30
    ON OFF OFF ON OFF = 120 FSB 80/40
    OFF OFF OFF ON OFF = 117 FSB
    ON ON ON OFF OFF = 114 FSB
    OFF ON ON OFF OFF = 111 FSB
    ON OFF ON OFF OFF = 109 FSB
    OFF OFF ON OFF OFF = 107 FSB
    ON ON OFF OFF OFF = 105 FSB
    OFF ON OFF OFF OFF = 103 FSB
    OFF OFF OFF OFF OFF = 100 FSB 66/33
    ON OFF OFF OFF OFF = 100 FSB
    OFF ON ON ON ON = 66 FSB
    ON ON ON ON OFF = unknown
    ON ON ON ON ON = unknown

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