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The Power Supply Unit of a computer is basically the part of the computer that connects and powers all components of the computer, without a power supply for a computer the computer would not even be able to power up as there is of course no electrical supply. As you go into higher end systems that have internal components doing more sophisticated tasks, this means that more power is needed from the Power Supply Unit, so if you were to upgrade lots of parts to your computer, its a good idea to upgrade your Power Supply Unit to so that you can provide enough power for all of your computers components.

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