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You have to consider the power rating of the motherboard, processor and add-on devices such as video and sound cards. The video and sound cards, for example, take some of the load off of the processor but they consume more power than your typical on-board audio and video chipsets. The best way to go is to at least match the power rating of the old power supply, but you can usually go higher without much added cost. It's best to go higher if the customer had added components or is considering upgrading his motherboard, processor, et cetera but keeping the same case and power supply. Too small a power supply will cause problems such as poor performance and overheating; you won't run into a problem with "too much power" available from the power supply because the computer will only draw what's needed from it.

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15y ago

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