Skurj, you must have been pretty happy when you finally got it!
Ammo, you can overclock two ways:
1. Overclock just the CPU, if it is unlocked, by changing the multiplier. You are only limited by heat, and the quality of the cpu chip.
2. Overclock your whole system, including your peripherals, by raising the Front Side Bus. Here you are limited by how much your video card, hard drive, etc are willing to run out of spec. That is my understanding.
So yes, if you unlock your CPU, you can play around with the speed of it - EASY to do in your Epox bios. Heat is the problem, because higher speed makes more heat. To seriously overclock, you would need a better fan/heatsink than came with your cpu. You can possibally turn a 1400mhz cpu into a 1700 mhz cpu this way. Most people look at it as a hobby, because you sometimes have to do a lot of fiddling with it, and you risk ruining your cpu if you screw up.