Works realy FSB runs with 333Mhz,
but if you want a better "performance" on LGA 775,
first you should overclock the Front Side Bus alone,
WITHOUT overclocking the CPU.
FSB 400 on the most mainboards run.
Fix the Clockspeed of the CPU to 2,4 Ghz for energie saving.
Overclock your RAM, for better Timings should be worth, too.
I play and work better and stable with this undervalued settings.
Greetings
Alu