mm...as far as i know, you can oc your graphics by using some software. (never did it though...\'cause gf2 64 DDR is enough for me).
but generally, when you oc your cpu, you can increase the FSB , the multiplier, or even both.
and you can do that either from the cmos setup(BIOS) or directly from the jumpers on the mobo.
but yeah..you need a good cooling for that since amd is extremely hot, and i wouldn\'t recommend you to do that without a good cooling. i\'ve been trying to make my own water-cooled system but the plan has be halted for a while now.