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Last time i ask about psu requirements... i promise - Page 2

post #11 of 60
Reviews I've seen show just over 700w being pulled from the wall on 2 stock GTX580's with a stock cpu (measured with kill-a-watt). I would have to say that 3 would not work on any 850w psu, especially if you OC the cpu.
post #12 of 60
Quote:
Originally Posted by WTHbot View Post
I would say no to it and I'm one of the more conservative people here on this forum when it comes to wattages.
No. Especially not if you are overclocking.
I don't think there is even a question. (Who has said yes?)
iirc a 580 pulls ~250w under load...so 3 would pull somewhere around 750 for the GPUs alone.
Thats before overclocking and other system components.

I would recommend somewhere in the neighborhood of a 1000w unit.

http://www.overclock.net/power-suppl...alculator.html

From what ive seen the 1050HX is fairly unimpressive.
http://www.newegg.com/Product/Produc...82E16817371012
http://www.newegg.com/Product/Produc...82E16817256069
Those are my 2 recommendations. Or that super-flower gold unit.
But im no PSU guru.

EDIT: I was thinking of the HX1000, not the HX1050
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post #13 of 60
Three GTX 580s can't pull 250W each due to scaling.
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post #14 of 60
Quote:
Originally Posted by TwoCables View Post
Three GTX 580s can't pull 250W each due to scaling.
Unless you are folding.
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post #15 of 60
I would say no.
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post #16 of 60
Quote:
Originally Posted by TwoCables View Post
Three GTX 580s can't pull 250W each due to scaling.
True, But Im using that as a safe guideline.
If SLI580s and a system under them pull ~700w from the wall there is no way an 850 can hold up 3 with an overclock AND load.
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post #17 of 60
Quote:
Originally Posted by PhilWrir View Post
From what ive seen the 1050HX is fairly unimpressive.
I think it's the Corsair 1000HX you may be thinking of? I think it was Shub who said the HX1050 is one of the best PSUs in it's wattage league, or something similar, for the price.
post #18 of 60
Quote:
Originally Posted by PhilWrir View Post
True, But Im using that as a safe guideline.
If SLI580s and a system under them pull ~700w from the wall there is no way an 850 can hold up 3 with an overclock AND load.
Pulling 700W from a wall outlet means that the system pulls about 595W from the PSU.

I'm not saying that I think a system that has three GTX 580s would work with a quality 850W unit, but I'm just pointing out that the power draw at the wall is not the measurement to go by. It can only be used to approximate how much power the system is pulling from the power supply.
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post #19 of 60
Get a AX1200 to be safe. A lot of people compare stock GTX580s but once OCed they pull a lot more Watts.
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post #20 of 60
Quote:
Originally Posted by TwoCables View Post
Pulling 700W from a wall outlet means that the system pulls about 595W from the PSU.

I'm not saying that I think a system that has three GTX 580s would work with a quality 850W unit, but I'm just pointing out that the power draw at the wall is not the measurement to go by. It can only be used to approximate how much power the system is pulling from the power supply.
I know. What is measured at the wall is a gross overstatement due to whats lost to heat, inefficiency, etc. I still feel its a good (if inaccurate) way of determining though. But thats probably because PSUs arent something I specialize in.

(stupid question)
Are they usually rated for their actual output or how much they can pull?
i.e. is an 850w able to actually provide 850? or is that the most it is capable of sucking down?

Quote:
Originally Posted by Princess Garnet View Post
I think it's the Corsair 1000HX you may be thinking of? I think it was Shub who said the HX1050 is one of the best PSUs in it's wattage league, or something similar, for the price.
Oops. Good catch.
Ill go back and Edit that.
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Micro Mule
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