Originally Posted by Andynz
How do I overclock the 2500k with my current chosen motherboard?
OCN actually has a decent thread explaining the ins and outs of overclocking. It's an essential read, so make sure you read it, but I'll give a quick summary (hastily written so please excuse the sloppiness and don't use this as a replacement to the linked article!)
Here is the article: Intel Overclocking Guide
You'll perform your overclock by raising the multiplier (ex. 33x = 3.3 gHz and 45x = 4.5 gHz). All of these settings should be changed in your BIOS/EFI/UEFI
This needs to be counterbalanced by raising the vcore (core voltage). Don't raise this too high as this can kill your CPU! NEVER go above 1.5 V (I would stay much lower than that to be safe as well). The vcore should be raised slowly until your overclock is what we call 'stable'.
What does 'stable' mean? Exactly what it sounds like. The computer should boot and be able to function properly under stress tests. Good ones are Prime95 and IntelBurnTest. I like IntelBurnTest because it is a quicker stability test. You should be able to do about 20 runs on very high settings.
Important: Overclocking is limited by voltage and temperature. If you don't get an aftermarket cooler, temperature will most likely be a huge limiting factor and you won't get much of an overclock at all.
Use a program like SpeedFan or RealTemp to check the temperature of your CPU during stress testing to make sure that your CPU core temperatures do not exceed 80 degrees Celcius or so.
Again, this is by no means an acceptable overclocking guide, but merely something to give you a taste on how it is done so you can see if you are interested.