source : http://www.pinoytechguy.com/tips-and-tricks/guide-to-overclocking
What do I need to know before I start overclocking?
A lot actually, but I won’t burden you with semantics and simply present the facts.
* What is the risk of overclocking?
o In most situations, Overclocking will void the warranty of your equipment.
o The lifespan of the CPU and other devices will be shortened.
o You could potentially destroy your CPU, memory, motherboard, and other expensive items.
o Your warranty could also be in jeopardy
o Room temperature is likely to increase.
o Your system could become unstable
o You might become an OC Addict
* What tools do I need? (will be edited to add more items)
o Informational/diagnostic software [like CPU-Z]
o Monitoring software
o Overclocking software [like ClockGen].
o Stability check
o Performance benchmark [like 3D Mark]
o Added Cooling for your PC
o An overclocking guide like this one
* Potential Problems
o A Blue Screen Of Death during boot indicates a RAM issue.
o Rebooting while in Windows or when just about in Windows may be the result of too low a Vcore or overheating due to excessive Vcore.
o A system that beeps or hangs when first rebooting likely has multiplier or FSB configuration that exceeds what the system can handle.
o Syntax error that comes on screen when booting indicating a file that can’t be found or is corrupt is likely due to too low a Vcore”