Well, actually i ran 600FSB PL8 on the stock cooling with MX-2 tim and added washers on the back of the board, Swiftech NB max block on top of the hpa.

It took 1.73V (1.76V in bios) to run 32M but it finished.

As you can see my NB runs very cool with this EK block on it, 32ºC is right after i finished the run and with 1.73V in bios.

Maybe i can do with lower NB volt but since the NB runs fairly cool i wasn't too worried to push some volts.

You may actually be onto something, not every cpu likes high FSB, pushing Vpll some will raise the limit some.