What limits your PSU.

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MAJO

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Nov 5, 2013
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Hello,everyone.
I'm quite new to building pc's,i've normally just bot of the shelf ones'.While taking on my first pc build i've come into a problem,PSU wattage.I'm wondering what specific parts of a computer limit your power supply.All help is much appreciated.

-MAJO
 
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Titan
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May 18, 2007
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What do you mean by "limit the PSU" here?

There is no upper limit to how high the PSU's rating can be other than the limits of what your computer case and electrical breaker can accommodate but there are limits to what makes sense paying for for any given build.

The lower limit is whatever the sum of your components require with some margin for aging, temperature derating, potential future additions/upgrades, efficiency sweetspot, etc. so in general, you want a PSU with a rating ~50% above what your system requires. If your system requires 300W peak power (I'm takling about the real power requirement, not the sticker rating on video cards that "require" 500+W PSUs for 100-150W cards), you want a good PSU rated somewhere between 450W and 600W.
 
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M

MAJO

Honorable
Nov 5, 2013
10
0
10,510

Sorry, should have been clearer.I mean what specific parts of a PC choose how high your PSU needs to be rated.so basically,how to choose the right wattage for your PSU.



 
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