How to know if the motherboard or processor is limiting the increase in FSB?

Everything is in the title.
How to know if the motherboard or processor is limiting the increase in FSB? How to avoid the motherboard or processor in a rise in FSB?

what's your cpu and what is your motherboard could perhaps say, the only reliable solution is to test the cpu on a motherboard that rises above where you have blocked or test a cpu on your motherboard that rises above yours.

Finally, if you see the amount the v fsb and the v Northbridge, a hole if not, then I believe it comes from the cpu

E6750 on a DS3R

so if the FSB and volts Northbridge eat and I still can not mount when the FSB is that it comes from processor?

yes volts would mount your motherboard. how you block it?

block 480 (regardless of the coef)
I actually purcased a processor that goes well but it is annoying FSB greatly that I am limited

Is it hot? Could be the possibility of improper or unstable overclocking.