OC or Overclocking is merely raising one of the frequency inputs that control the final core speed to improve performance.
If you raise the maximum multiplier for boost clock it will NOT run at boost speeds all the time, it only allows the chip to attain the higher speeds in scenarios where it would have previously used its stock boost speed.
If you raise the FSB or equivalent by a percentage the core speed is increased by that percentage at idle states and boost speeds.
Some here disable the core boost feature to allow the chip to run at full speed at all times, this however requires more power and makes more heat for the entire time the chip is powered on.
My suggestion would be to post some CPU-z screenshots of your CPU and memory and allow people here to help you attain the best performance for what you have.