The real question is "why would you want to?". Overclocking is just like
running a car's engine past the redline. Sure it'll go a little (very
little)
faster, but at what cost?

The idea of overclocking is that processors are usually rated very
conservatively.

In the case of AthlonXP processors, they are considered an overclocker's dream
because they typically have a lot of overclocking headroom, especially the
Thorougbred B core and particularly the Barton core.

After you've unlocked the CPU, you can overclock something like an AthlonXP
2500+ with the Barton core and 512Kb cache to run at close to 3000+ levels
without difficulty or problems. This is because these two processors have the
same core, they're just rated differently on the markings.

Of course, this does not negate the fact that there is a risk when you do
overclock something. Also instabilities can arise not just from the processor,
but also from the bus and the components that are connected to it. For
instance, if you push the bus up higher beyond the capabilities of the RAM, you
can have instability problems arise out of the memory. - Reinhart