The simplest way to overclock a processor is to change a value of a bus multiplying ratio (multiplier). This is also the safest way: the voltage on the processor’s kernel and the bus frequency are stable. The other elements – memory, video card, hard disk – are also unchangeable. But this way of overclocking can only be used for outdated processors and motherboards. All modern processors, with some exceptions, have unchangeable multiplying ratio.
The second way of overclocking is to change the bus frequency. As the processor’s frequency is defined as a multiplier multiplied by the bus frequency, this is often the only real way to increase the productivity of your processor and other elements connected by this bus. But this method may cause a set of negative effects: the screen may be off because the video card cannot operate normally with increased frequency; all data on the hard drive will be lost because of increased data flow; and, finally, memory modules will be failed. Nowadays, the bus frequency is also recorded in the processors by Intel, so if you change it using system tools, a computer stops functioning.
The third way of overclocking is to increase the voltage supplied to the device’s supply contacts. This is the most dangerous way that may “burn” all your devices.