Ok. I guess it's like "chipping" a car? You hack into the CPU and tweak it?
Sort of, though no 'hacking' is involved. The speed of a CPU (measured in MHz or GHz these days) is calculated by taking the FSB (front side bus) speed, and multiplying it by a pre-defined amount.
In the computers BIOS (basic input output system - the 'settings' that you can specify for the hardware in the PC before booting into Windows or any other operating system), there will be an option to change the value of the multiplier as well as the VCORE voltage. (there are many other settings, but there are usually the only two you need to modify)
For example, my CPU the i5 2500K, comes with an FSB speed of 100MHz and a multiplier of x33 when at factory settings, outputting the clock speed of 3300MHz (or 3.3GHz).
I increased the value of the multiplier to 46, and now it sits at 4.6GHz
Of course this has certain trade-offs. The CPU will give off more heat (which is why aftermarket CPU coolers are available to tame said heat) and you will also need to marginally increase CPU voltages because the CPU will require extra power to run at an increased speed.
The process is usually quite simple, but it has the potential to be quite complicated in some cases. Every individual CPU will react slightly differently to overclocking (some will require more voltage than others for example), and you will also need to test the stability of your overclock by 'stress testing' the CPU.
Stress testing basically emulates a situation where the CPU is put under the maximum possible strain, to ensure that the overclock stability and temperatures are all in check.
Intel's 'K' and 'X' series CPU's (2500K, 2550K, 2600K, 2700K, 3570K, 3770K, 3930K, 3960X, 3970X) are designed with overclocking in mind, and these are the only CPU's which come with an unlocked multiplier to allow for you to do this. Intel made them, knowing that people would overclock them
The same thing applies for AMD's 'Black Edition' CPU's.
It would probably be a good idea to head over to the 'overclocking and cooling' section when the time comes, you should receive a lot of helpful advice in there, and there is also a section where you can ask OcUK's resident overclocking expert 8 Pack for advice as well.
