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what happens when totl power draw exceeds psu rating? - Page 2

post #11 of 32
Most new boards have anti-surge protection, mine does. So should be protected from any damage. Antec.com has a useful PSU calculator. Reaching PSU limit usually results in power loss or crash.
Most recommendations for PSUs are very conservative and most benchmarks of total system draw I've seen don't go over 500w even with a GTX480 or 580. Correct me if I'm wrong.
Edited by Ding Chavez - 12/21/10 at 1:12pm
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post #12 of 32
Thread Starter 
thanks for the info mate I used the calculator there and iut says i need a 630w psu minimum. Its the overclocking of the gtx460s that skyrocket the peak power apparently, looking at the link I posted before. Seems ill be ok just not going to overvolt the 460s . cheers guys and +1 rep for all who helped
    
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post #13 of 32
Quote:
Originally Posted by Juliancahillane View Post
thanks for your input but I think your mistaken, the manufacturer could not market a power supply as supplying 650w, or any wattage, if it didnt. What the 80% efficiency means is that the power supply provides 650w while being 80% efficient, meaning that when providing 650w, its wasting energy at a rate of 20%. Meaning that its really drawing 20% extra from the wall, being 130w extra, totalling 780w.

I read that a few months ago while reading a psu review article from a reputable site, just cant think where it was now .

Im confident the psu would handle the setup, just not with a heavy overclock through overvolting the cards, ill probable see what I get on the stock voltage.

Somebody correct me if Im wrong lol
Pretty sure Shub was right the power from the wall is higher than what the PSU can handle, not sure were you read that the PSU takes more watts from the wall, also pretty much every psu calculator is bloated I mean they're trying to sell you PSU's also they calculate as if you're running at full load all the time.
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post #14 of 32
Thread Starter 
so you guys really believe that a company can market its products as a certain wattege when they actually output less - come on, thats just common sense, think about all the lawsuits they would have.
    
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post #15 of 32
Quote:
Originally Posted by Juliancahillane View Post
so you guys really believe that a company can market its products as a certain wattege when they actually output less - come on, thats just common sense, think about all the lawsuits they would have.
Think about all the millions of legal arguments along the lines of "PROVE it can't do its rated wattage. Oh, you don't have the $25k testing setup? Too bad, lawsuit dismissed." Not to mention there's no legal or regulatory definition of what "wattage" means in regards to power supplies.

http://hardwareaware.com/review/linkworld-430w/

That's a 430W that couldn't do 300W if it tried. If you search the reputable review sites you'll find dozens of examples that power supplies that either can't reach their rated wattage, or violate the ATX specifications at those levels.

Please don't be so naive. These companies can get away with a lot.
post #16 of 32
I think you're misunderstanding what he's saying...the power output going from the PSU to computer components is up to 650W, but the power being drawn from the wall is potentially greater than 650W because the PSU is not 100% efficient.
post #17 of 32
Thread Starter 
Quote:
Originally Posted by MDUK View Post
I think you're misunderstanding what he's saying...the power output going from the PSU to computer components is up to 650W, but the power being drawn from the wall is potentially greater than 650W because the PSU is not 100% efficient.
correct. You dont need to be a psu guru , just common sense

edit: - Ive just seen your psu guru man, your clearly paraniod lol
    
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post #18 of 32
Quote:
Originally Posted by Juliancahillane View Post
thanks for your input but I think your mistaken, the manufacturer could not market a power supply as supplying 650w, or any wattage, if it didnt. What the 80% efficiency means is that the power supply provides 650w while being 80% efficient, meaning that when providing 650w, its wasting energy at a rate of 20%. Meaning that its really drawing 20% extra from the wall, being 130w extra, totalling 780w.

I read that a few months ago while reading a psu review article from a reputable site, just cant think where it was now .
That's a different way of saying exactly what I said, so I'm not sure where you got the impression that I was wrong... but if I am wrong then so are you
Anyway, that is correct and once again that's what I was saying.
And once again, your PSU is fine for two GTX 460s, even overclocked.
post #19 of 32
Thread Starter 
haha thanks man, sorry about any misunderstanding there

edit: - well we will know for sure if my rig blows up over the next few hours or so...........Ive just gotta throw this out there - my pc is a beast now! love it. such an upgrade, the prolimatech is also amazing
    
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post #20 of 32
There's no chance your computer will blow up. Your PSU is good quality. The worst that will happen if you try to draw too much power from it is that it will shut down harmlessly. But that's not gonna happen because your total power draw will never exceed 600W DC, and most likely not even 550W.
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