Used to be that when you raise the FSB, the RAM speed goes up with it as well. These days it runs asynchronous of the FSB - it isnt affected by the FSB as much as it used to, not directly anyway. you can run a CPU at say, 200MHz FSB, but if your RAM isnt rated DDR400, you may want to scale back the RAM speed a bit in the BIOS, thereby running it slower than the CPU.
So in short it will only run as fast as the MOBO is capable...333mhz FSB.
As far as I can tell thats the way it is,maybe someone has something to add....
Cactus

