Overclock: why & why not?

Overclocking is the process of running a computer component at a higher clock rate (more clock cycles per second) than it was designed for or was specified by the manufacturer, usually practiced by enthusiasts seeking an increase in the performance of their computers. (http://en.wikipedia.org/wiki/Overclocking)

We can say that overclocking will 'force' our computer (especially the CPU and/or graphic card) to work harder in order to make it able to produce more and better result than usual in a period of time. For people who want to increase the performance of their computer without upgrade, overclocking is the best (for several cases) solution.

Why:

• Great solution for low-end computers, you don't have to upgrade the components
• Reducing lag on heavy memory usage
• Faster data processing
• Better game performance and graphics 
• Increase time before an upgrade is needed 
• Can be used to test the component's durability

Why not:

• Overclocking will damage your computer's component, reducing its lifespan
• More electrical power consumption
• Overclocked components produce more heat that may damage another components
• Excessive heat (risk of fire) demands computer to be turned off every several hours
• Void the component's warranty
• Overclocked components have very low reselling prices
  

Sample of overclocking results