Many OCers prefer to run their memory at 1:1 so if you have memory capable of DDR2-1000+ you will be able to run 1:1 at 500FSB. Otherwise you need to use the dividers/multipliers to push the memory to its maximum capability which cna lead to more problematic overclocking (less stable sometimes).
The benefit to running at 9x400 obviously is less stress on the board as you will need higher NB voltages to maintain 500FSB, expecially with a quad.
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