A power supply unit is the component that supplies power to the other elements in a computer. More particularly, a power supply unit is typically planned to transform general-purpose alternating current electric power from the mains to working low-voltage DC power for the internal components of the computer.
The most usual computer power supplies are made to match to the ATX form factor. This enables particular power supplies to be interchangeable with distinctive components inside the computer.
ATX power supplies also are created to turn on and off using a indication from the motherboard, and supply assist for modern functions such as the standby mode available in most of the computers. The most recent specification of the ATX standard PSU as of mid-2008 is version 2.31.
Computer power delivers are rated based on their highest output power. Typical power ranges are from 300 W to 500 W lower than 300 W for small form factor systems and are intended for ordinary home computers. Power supplies used by gamers and enthusiasts mostly range from 450 W to 1400 W. Typical gaming PCs feature power supplies in the range of 500-800 W, with higher-end PCs demanding 800-1400 W supplies.
The top-end units are up to 2 kW strong and are created mainly for servers and, to a lesser degree, extreme performance computers with multiple processors, a few hard disks and multiple graphics cards. The power rating of a PC power supply is not officially certified and is self-claimed by each company. Power Supply Fundamentals:or How PSU Power Ratings Mean Almost Nothing A common way to reach the power figure for PC PSUs is by adding the power obtainable on each rail, which will not give a true power figure. Therefore it is possible to exceed a PSU on one rail without having to apply the maximum rated power.
There are many power supply in the markets such as 65 WATT power supply,100 WATT power supply,125 WATT power supply but before buying be sure of its power level.