Well we need to know what video card you have first, but if you have a pretty common question usually its a good idea to check the sticky threads.... here is one in this section that pretty much goes over all the cards, and utilities to download to OC your card and more.
Patience young jedi.try rivatuner if you have a nvidia and rage3dtweakhttp://www.rage3d.com/?node=r3dtweak for ati. http://www.guru3d.com/rivatuner/
I have used both .I currently use riva tuner to push my anemic270/400pny5500 to a slightly stouter 340/500.I used rage3d on my last ati card and was pleased with it's performance.Good luck
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