Power supply usable watts

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iam2thecrowe


technically yes. But using 350w of a 350w PSU, its like running your car engine on the redline, something will give a lot sooner than if you take it easy. PSU's also get noisy and hot near their max load. Ideally you want to have at about 30% headroom for reliability. so if you know your system is going to top out at 350w maximum load, you'd probably want to get a 500w PSU.
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iam2thecrowe

iam2thecrowe

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Jul 4, 2010
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to be honest, the only way to truly know is to find a review of the psu where they load test it. As a general rule i stick to you cant go wrong with Antec, Corsair, seasonic or XFX. They generally don't lie about their psu specs across all their models. Obviously the cheaper models have cheaper components and may not last as long or the power may not be as clean, but they will at least produce their rated power. Some psu manufacturers (normally the cheaper ones) will blatently lie on the packaging about the wattage, and some how they get away with this.
 
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Delroy Monjo

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Oct 10, 2013
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Maybe this will help:----->http://www.tomshardware.com/answers/id-1804779/power-supply-unit-tier-list.html
Also this:----------------->http://www.tomshardware.com/reviews/power-supply-specifications-atx-reference,3061.html
 
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iam2thecrowe

iam2thecrowe

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Jul 4, 2010
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technically yes. But using 350w of a 350w PSU, its like running your car engine on the redline, something will give a lot sooner than if you take it easy. PSU's also get noisy and hot near their max load. Ideally you want to have at about 30% headroom for reliability. so if you know your system is going to top out at 350w maximum load, you'd probably want to get a 500w PSU.
 
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millwright

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I more thing.
A power supply rated for 350 has no idea it is only 350watts, so if you connect it to a computer drawing 400watts, guess what.

That power supply will put out 400 watts.
Load control how much juice the power supply puts out.

It won't be clean power.
It will be hot.
It will put out 400watts til it dies.
 
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iam2thecrowe

iam2thecrowe

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Jul 4, 2010
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most decent psu's will have an overcurrent protection and the psu will shut down.
 
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