I flagged yours, motopsychojdn as best answer as it is true, at least to the best research I can come up with.
Which leaves me with just one point to leave for anybody else who gets here googling for an answer.
Knowing that it's the total frequency the processor is running at that will most determine the voltage needed to maintain stability, that leaves only two reasons to play with the FSB, AKA base clock anymore. One: to get that last 15mhz that the CPU can handle or, and this is probably the best one...
...to get the most in overclocking the RAM.
I reserve the right to advise and extend my remarks. (That just means I might want to change my mind and say, "What I meant to say was....)