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Dose most companies under rates their power supplies?

post #1 of 16
Thread Starter 
Just, Wondering because someone commented on one of my thread and said.

Quote:
Originally Posted by AgentGOD View Post
Corsair usually under-rates their PSUs. Their 750W is actually an 850W, and their 850W is actually a 1000W. My 1200W is actually a 1500W.
is it true that most companies under rates their power supplies.
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post #2 of 16
Quote:
Originally Posted by bigdog320 View Post
Just, Wondering because someone commented on one of my thread and said.

is it true that most companies under rates their power supplies.
I'm not sure about the above statement but I can say that many of the low quality brands OVERRATE their power supplies. eg their "850w" unit is really a 400w unit
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post #3 of 16
The well respected brands usually have "underrated" units. I put that in quotes because the advertised wattage for respected brands is the continuous rating, not peak power. Crappy brands advertise peak power, and in many cases, they can't even reach advertised peak power without going boom.
post #4 of 16
Hey ya,

Um I wouldn't say that quote is entirely true tbh. If I remember rightly corsair did actually ask 80+ to mark one of their PSU's as bronze even though it could have gone through as silver... But as for that comment, I don't think so.
post #5 of 16
Quote:
Originally Posted by compuman145 View Post
Hey ya,

Um I wouldn't say that quote is entirely true tbh. If I remember rightly corsair did actually ask 80+ to mark one of their PSU's as bronze even though it could have gone through as silver... But as for that comment, I don't think so.
What are you referring to? Try to use quotations so we can understand what you're talking about. Asking for a bronze cert for a unit that can barely pass silver would be underrating.
post #6 of 16
Yes and no. The Higher quality ones do but don’t go out and buy a 750w when you need an 850w. It's like paintball air tanks where my 4500psi tank is rated for 4500psi *duh* it won’t blow up on me if I put 4600psi but it’s just not recommended. (Kind of a bad analogy but it was all I could think of off the top of my head) It’s mostly just for extra headroom for overclocks and "Extreme Benchies" that just MIGHT push it over "850w" or whatever. ALSO! DO NOT CHEAP OUT ON YOUR PSU! Spend the extra $10 or $20 to get a brand name one Vs. an off brand one.
    
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post #7 of 16
Well there's a difference between underrating, and the manufacturer leaving headroom.

Take this example. Corsair's VX550 power supply is a Channel Well PSH-550 unit. It's a very high quality 550W power supply.

But Rocketfish (a Best Buy house brand) sells the same PSH-550 (with cheaper capacitors and a different exterior) as a 700W power supply (RF700 v2). As a 700W power supply, it's mediocre at best.

When you buy an xxxW power supply from a quality brand, you can reasonable expect it to be able to provide 50-150W or more above its rated wattage. But it isn't recommended, and performance and reliability at those levels will be far less than if you treat it as what it's rated for.

Underrating would be if Corsair took a PSH-750 and sold it as a 550W. This is fairly rare, and usually only done if the manufacturer's claims are false, so the reseller labels it as lower. For instance, Dynex (another Best Buy brand) underrates the Huntkey Green Star 450W as their Dynex 400W, because the GS-450 blows up if you push it over 400W.
post #8 of 16
Lol I was waiting for this reply so I could have a read

Phaedrus to the rescue
post #9 of 16
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
Well there's a difference between underrating, and the manufacturer leaving headroom.

Take this example. Corsair's VX550 power supply is a Channel Well PSH-550 unit. It's a very high quality 550W power supply.

But Rocketfish (a Best Buy house brand) sells the same PSH-550 (with cheaper capacitors and a different exterior) as a 700W power supply (RF700 v2). As a 700W power supply, it's mediocre at best.

When you buy an xxxW power supply from a quality brand, you can reasonable expect it to be able to provide 50-150W or more above its rated wattage. But it isn't recommended, and performance and reliability at those levels will be far less than if you treat it as what it's rated for.

Underrating would be if Corsair took a PSH-750 and sold it as a 550W. This is fairly rare, and usually only done if the manufacturer's claims are false, so the reseller labels it as lower. For instance, Dynex (another Best Buy brand) underrates the Huntkey Green Star 450W as their Dynex 400W, because the GS-450 blows up if you push it over 400W.
Thanks very information,

So if i read this right his Corsair AX-1200 isn't actually putting out 1500W right?.
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post #10 of 16
A PSU only puts out what is drawn from it. Say a system was drawing 300W with a 500W PSU. If you swap a 850W PSU in, it's still only going to draw 300W (it may differ a slight bit due to efficiency and such, but that's besides the point). It only converts what the PC needs to pull. It's wattage is a label of what it is cabale on converting. It's not like it suddenly produces "more power!" for your PC suddenly by being there. It's actually quite wasteful to have to much excess. People don't often understand this.

As for a 12000W PSU putting out 1500W, being able to do it, and having the lasting piece of mind as it does it with good ability are two different matters.
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