If u over clock the processor do u also need to overclock everything else.........i have my Processor overclocked From 2.2ghz to 2.43ghz and i would like to go more but dont know if something will happen if nothing else like vid card is overclocked.
Your video card won't be affected I don't believe.
Overclocking the processor is more likely to affect your RAM voltages/timings, and also maybe motherboard speeds also relating to the processor.
Overclocking the FSB will for instance increase the speed of the CPU, but along with that to get more, you may need to increase the voltage, if the standard voltage isn't giving enough power for the overclock.
Always be careful when overclocking though. Too much of an increase can easily damage your system. Usually by it frying, because not enough cooling has been achieved...