SB51G

Please check the jumper on JP4 first. If no jumper is set, please add a jumper cap to pin2 and pin3. If a jumper is installed on pin1 and pin2, please remove it and install it on pin2 and pin3.

If a 400 MHz CPU with a 100 MHz FSB is installed, the CPU clock ranges from 100 MHz to 132 MHz. If a 533 MHz CPU with an FSB of 133 MHz is installed, the CPU clock ranges from 133 MHz to 165 MHz.

According to Intel chipset specification,

1. FSB 400 MHz and DDR 200 supported.
2. FSB 400/533 MHz and DDR 266 supported.
3. FSB 533 MHz and DDR 333 supported.

and standard design guide:

1. When using CPU with FSB 100(400) MHz, DDR can only run DDR333(PC2700) at 266MHz.
2. When using CPU with FSB 133(533) MHz, DDR333(PC2700) can run both 266MHz and 333MHz.