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A normal computer has a wattage or power supply of 300 to 500 watts. However, if you're going to use your computer for gaming, the power supply should be between 500 and 800 watts. Some computers come with a power supply of 1 kilowatt, but this isn't necessary for most users.Source:
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Does a battery backup for a computer have to have the same wattage as the power supply the computer?
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