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you CAN run gtx 480's and an OC'd proccessor on an HX850! - Page 6

post #51 of 77
Quote:
Originally Posted by TwoCables View Post
I have to admit that I'm not sure. I mean NVIDIA recommends a 600W power supply to power a system with one, so a quality 750W should be enough. However am I correct to be remembering that the Lightning version says it requires a 700W power supply for a system with just one Lightning 580 in it? I mean if I'm remembering correctly here, then that would mean that even the X-750 would be cutting it close.

So I think it depends on that.
It should use the same amount or even a little less according to most reviews than the standard 580, I think the real consideration here is the 100mV overvolt, putting them at ~1.15v. The second review, HardOCP, I linked shows their consumption both stock and with a 150mV overvolt to give some numbers to go off of.
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post #52 of 77
Quote:
Originally Posted by juano View Post
It should use the same amount or even a little less according to most reviews than the standard 580, I think the real consideration here is the 100mV overvolt, putting them at ~1.15v. The second review, HardOCP, I linked shows their consumption both stock and with a 150mV overvolt to give some numbers to go off of.
Whoa. According to the overclocked HardOCP test, it looks like they got their Lightning 580 to pull 405W on its own (375W on its own when not counting the system idle power draw).

So I don't know. I mean if I assume that a second card would add 350W (due to SLi scaling), then that could mean a total system power draw at the wall of about 900W which comes out to be about 765W after figuring 85% power supply efficiency. If I assume that a second card would add about 300W (due to scaling, then that's obviously much better at approximately 725W (still assuming 85% efficiency).

So, I think I need to find out just how much a 2nd Lightning 580 would add to HardOCP's test results.
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post #53 of 77
Their system is a 1366 at 3.6Ghz though, which I'd imagine pulls much more power than a 1.34v Sandybridge. I don't know if that factors into anything here though. I also would be 50mV less than their OC power draw (100mV for me vs. 150mV for them) but then again I would be folding 24/7, so I don't know if SLI scaling applies because F@H scales pretty well LOL. This really is pretty close I think.
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post #54 of 77
Well, that answered my question about power draw O_O Lightnings are hogs You CAN run an OC'd X6 and two GTX 480's on a HX850. But it all comes down to how much of an overclock.
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post #55 of 77
Quote:
Originally Posted by jellis142 View Post
Well, that answered my question about power draw O_O Lightnings are hogs You CAN run an OC'd X6 and two GTX 480's on a HX850. But it all comes down to how much of an overclock.
Where do you see that? Everything I have seen shows that they draw less than or equal to standard 580s
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post #56 of 77
Quote:
Originally Posted by juano View Post
Where do you see that? Everything I have seen shows that they draw less than or equal to standard 580s
I don't know much about the 5XX series, but I was referring to the post TwoCables posted before mine showing the MSI GTX 580 Lightning pulling roughly 400w by itself. I don't necessarily know how much an OC'd 580 from other manufacturers can pull, but it's just shocking how much it is.
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post #57 of 77
Quote:
Originally Posted by jellis142 View Post
I don't know much about the 5XX series, but I was referring to the post TwoCables posted before mine showing the MSI GTX 580 Lightning pulling roughly 400w by itself. I don't necessarily know how much an OC'd 580 from other manufacturers can pull, but it's just shocking how much it is.
Yeah, that's why I said "whoa". Although, it only added 375W to the idle wattage power draw. hehehe
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post #58 of 77
Quote:
Originally Posted by TwoCables View Post
Yeah, that's why I said "whoa". Although, it only added 375W to the idle wattage power draw. hehehe
It's shocking because that additional power draw is more then my entire system pulls at full load
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post #59 of 77
Quote:
Originally Posted by jellis142 View Post
I don't know much about the 5XX series, but I was referring to the post TwoCables posted before mine showing the MSI GTX 580 Lightning pulling roughly 400w by itself. I don't necessarily know how much an OC'd 580 from other manufacturers can pull, but it's just shocking how much it is.
Oh, well in that case here check out the HardOCP review, and they show the Lightning compared to reference 580, and that 375w was with a substantial overvolt FYI.

Quote:
Originally Posted by TwoCables View Post
Yeah, that's why I said "whoa". Although, it only added 375W to the idle wattage power draw. hehehe
Meh, for my rig my load is my idle, F@H FTW.
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post #60 of 77
Well, I just ordered my second eVGA GTX480 SC, so I'm about to give this experiment a try, myself...
 
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