Will having a bigger power supply damage my pc?

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BenJLiu

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Apr 13, 2017
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I'm building a new pc and I'm planning on buying a evga supernova g2 750w but on the coolermaster power calculator the recommended power usage o get is 388W. Will getting a better psu be bad for my pc?



Also would a cx550m psu be better option ($60 cheaper)

CPU: Intel Core i5 7600k
GPU: Asus 8GB RX 480
Motherboard: Asrock Z270 Pro4
RAM: DDR4 Corsair Vengeance LPX 3000Mz
CPU Cooler: Cryorig H7
Case: Corsair Carbide 100R
Case Fans: 3x sickleflow led fans, 1x corsair 100r stock case fans
 
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techgeek
A power supply will only supply the power needed. So no, having a larger PSU won't harm your system. A well balanced system in my opinion would be a system that draws about 60% - 75% of the maximum rated power (on a quality PSU from a reputable name) at the max draw of the system. So if your system draws a maximum of 400W, a good 600W - 650W supply is good. Having more power also allows you room for future upgrades.

So in your case 750W will be overkill, but it won't harm anything. Just remember a PSU generally operates at it's maximum efficiency at around 50% of it's rated output.
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techgeek

techgeek

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Apr 11, 2004
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A power supply will only supply the power needed. So no, having a larger PSU won't harm your system. A well balanced system in my opinion would be a system that draws about 60% - 75% of the maximum rated power (on a quality PSU from a reputable name) at the max draw of the system. So if your system draws a maximum of 400W, a good 600W - 650W supply is good. Having more power also allows you room for future upgrades.

So in your case 750W will be overkill, but it won't harm anything. Just remember a PSU generally operates at it's maximum efficiency at around 50% of it's rated output.
 
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BenJLiu

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Apr 13, 2017
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In that case ill just stick with the 750 because the cheaper option from my pc shop (only one I'm buying at) is a evga g1 650w which people say are bad quality and are highly inferior to the g2. So I guess I'll just stick with the 750

 
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