equation relating motherboard FSB to Memory bandwith

[Ocite]

I have a question I cant answer. If I have a motherboard whos max FSB is 1333Mhz.
And it supports ram of 667Mhz ddrII dual channel.
My question is If lets say the Motherboard supported 800Mhz ram.
How can it be possible when the max base FSB of the board is 333Mhz(1333/4).
and since DDR2 doubles the Bandwith the max supported memory of a 1333Mhz

FSB board should be 333*2=~667Mhz

I hope the question is understood?

 

[Scotteq]

It's possible because you can set a memory divider in the Bios to run the RAM at a different speed than the FSB's. Most Bios' will show you the resultant as you select the various ratios available to you.