we must find a way to unlock the upper limit of the multiplier. Otherwise, with the Athlon64 (not FX series), the overclocking potential is limited for all CPUs. For example, i think that both 3500+ and 3800+ can be overclock to the same speed, while the 3800+ is slightly faster with no overclocking (and has 12x multiplier). Now, the multiplier has to be below 11x to make the system stable, when overclocked.
I will make some tests pretty soon, and i'll keep you posted. Some experiences from users will be appreciated, to save me some time experimenting