SB51G

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

If FSB 100MHz(400MHz) CPU is installed, the CPU Clock range is from 100MHz to 132MHz. If FSB 133MHz(533MHz) CPU is installed, the CPU Clock range is from 133MHz to 165MHz.

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.