Source:
Motherboard manufacturers began enabling overclocking features in the system BIOS rather than the tedious process of manual jumper or dipswitch settings. Combine this ease of use with the tremendous overhead available in many of today's modern processors, along with the ever-present lure of getting something for little or nothing, and it's easy to see why overclocking has become such a popular pastime.
...
This article is packed with information! Enjoy!