As the title says, I need help with overclocking my CPU to 2.4 GHz, but I can't find the Front Bus in the BIOS.

I've a Intel D945GCCR motherboard and always when I enter the BIOS in the first section the Front Bus is shown, but I can't select it, I wonder if someone have owned this motherboard and might help me to overclock my CPU.
I have Core 2 Duo processor, Intel E4400 @ 2.00 GHz.


Thanks in advanace,
Ouriel!