Professor James said:
I want my processor to perform better with games? How do you overclock it?
This depends on what you have.
If you have something like an i5 750 you could be messing with ram speeds, BCLOCKs, multipliers and the VCORE amongst other things.
If you had a i5 2500K for example, you would just adjust the multiplier and change the voltage until you got your CPU stable at acceptable temperatures.