This is really for the more serious geek. The downside of overclocking is that you can make your machine unreliable, at least until you turn the clock speed back down. Worst case scenario? You break you chip.

If you make your computer too fast for the processor or the other components in your computer, either the computer won't boot at all or it will crash a lot. You could even lose data on your hard drive. It isn't something to be played around with, and you shouldn't do it unless you're willing to take the risk. As always, back up your data before doing anything risky.