How to prevent overkill with a psu?

I don't know what this means could someone tell me just in case because I am buying a 700w psu?
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  1. Quote:
    I don't know what this means could someone tell me just in case because I am buying a 700w psu?

    A psu that provides much, much more wattage than your system requires.
    Typically you want to be at around 50% use under load ( this is generally where a psu is considered most efficient ) but with modern psu's 20-30% up or down isn't going to make much of a difference.
    Provide your system specs ( including psu make ) and someone will be able to tell you wether your intended psu is overkill.
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