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Dose most companies under rates their power supplies? - Page 2

post #11 of 16
High quality PSUs from reputable manufacturers are able to operate PERFECTLY at their rated power, but they nearly always are able to go beyond. The PSU will just no function with optimal efficiency and will likely die sooner.

But really if your computer draw X watts under full load you should always buy a supply of more than X wattss. X+20% watt is good idea.
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post #12 of 16
It often depends on the situation for the power supply. One example as mentioned earlier is the Thermaltake Toughpower XT TPX-775M. It is a 775w psu sold as an 80+ bronze psu, but it actually received a silver rating. In some reviews the testers had varying success with what they could draw from it in different situations; one was able to pull 920w from it while still within range for voltages, another was able to pull 990w at a cooler temperature.

It really depends on the manufacturer and individual products...
    
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post #13 of 16
No, Corsair doesn't "underrate" their Powersupplies. Thier 750w is a 750w, their 850w is a 850w, and their 1200w is a 1200w. High quality Powersupplies are able to deliver more than what the label says, for a certain period of time... but it's still advised to stay at or below the wattage on the label, otherwise you can expect worser performance and faster degradation of the internal components.

Quote:
Originally Posted by bigdog320 View Post
Thanks very information,

So if i read this right his Corsair AX-1200 isn't actually putting out 1500W right?.
His AX1200 can output 1500w, for a given amount of time.
Edited by GameBoy - 5/27/11 at 6:11am
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post #14 of 16
It's not about underrating or overrating. Instead, it's about whether it's peak-rated or continuous-rated. Almost every single PSU we consider to be "good" and "recommendable" is a continuous-rated power supply. NVIDIA and ATI make their PSU requirements based on peak ratings.
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post #15 of 16
Quote:
Originally Posted by TwoCables View Post
It's not about underrating or overrating. Instead, it's about whether it's peak-rated or continuous-rated. Almost every single PSU we consider to be "good" and "recommendable" is a continuous-rated power supply. NVIDIA and ATI make their PSU requirements based on peak ratings.
^ What he said

A bad power supply rated at 400W will die at 400W
A mediocre power supply rated at 400W will reach 400W for small periods ( during boot up, when the CPU reach 100 %...)
A good power supply rated at 400W will be able to sustain 400W forever
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post #16 of 16
Quote:
Originally Posted by darknight670 View Post
^ What he said

A bad power supply rated at 400W will die at 400W
A mediocre power supply rated at 400W will reach 400W for small periods ( during boot up, when the CPU reach 100 %...)
A good power supply rated at 400W will be able to sustain 400W forever
A mediocre 400w should be able to provide 400w continuously, usually just with not so good performance or build quality.
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