LOl, I haven't heard this one before.
Like SCofD said, disabling the cores doesn't amp up the speed of the remaining cores on a Q9550.
The Intel Nehalem processors can step up a little bit when other cores are not in use but not to 6.0 Ghz.
In fact, you'd need some god ol' LN2 (liquid nitrogen) to hit a clock speed of 6.0 Ghz.