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PSU for Ivy Bridge and SLI 670 - Page 4

post #31 of 59
Quote:
Originally Posted by Blindsay View Post

except if that you read my post i say that its 1000w at the wall or about 850wdc.
I seem to have missed that.
Quote:
Originally Posted by Blindsay View Post

edit: here is my at wall data from an old thread i posted in
"GPUS at 925/1425 (1.195v stock) - ~760w average (+0%)
GPUS at 925/1425 (1.195v stock) - ~925w average (+20%)
GPUS at 950/1425 (1.195v stock) - ~940w average (+20%)
GPUS at 950/1450 (1.195v stock) - ~942w average (+20%)
GPUS at 950/1475 (1.195v stock) - ~945w average (+20%)
GPUS at 950/1500 (1.195v stock) - ~947w average (+20%)
GPUS at 975/1425 (1.20v) - ~965w average (+20%)
GPUS at 1020/1425 (1.27v) - ~999w average (+20%)
"
So we're talking about ~850W peak load under Furmark + Prime95(I suspect)... so <800W under anything else, with a Gulftown and two 6970s.. no surprises really.
post #32 of 59
Quote:
Originally Posted by Unoriginal Sin View Post

I seem to have missed that.
So we're talking about ~850W peak load under Furmark + Prime95(I suspect)... so <800W under anything else, with a Gulftown and two 6970s.. no surprises really.

Forgot to post what that was with, sorry, it was OCCT

I like to know i have a power supply that regardless of what i run (Even OCCT or the like) that there will be no issues
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post #33 of 59
Quote:
Originally Posted by Blindsay View Post

Forgot to post what that was with, sorry, it was OCCT
I like to know i have a power supply that regardless of what i run (Even OCCT or the like) that there will be no issues
And that's perfectly fine... but the smartest approach to getting such a unit is not simply buying the highest output one you can afford, but buying the highest quality, highest end unit that will deal with such loads even if it does so at 100% load... because a high end unit at 100% load will still perform much better than a lower end one at 60% or 80% load. wink.gif

edit: generalization is the mother of **** ups, and there are of course exceptions to the above idea.. but the point still stands, you reach for higher quality and not higher output.
Edited by Original Sin - 5/9/12 at 9:08am
post #34 of 59
Seasonic x750 Gold: http://www.newegg.com/Product/Product.aspx?Item=N82E16817151087&Tpk=x750%20gold

I am running SLI 680s and a 4.8- 5ghz 2500k on this same PSU.

If you wanted a bit of overkill, you could get an 850w, but I wouldn't go higher than that. Focus on getting a quality unit and you'll be fine. I would shoot for 750 - 850w, a 650w unit would be cutting it close, and you wouldn't be leaving much room for PSU degradation.
Edited by svthomas - 5/9/12 at 9:22am
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post #35 of 59
Quote:
Originally Posted by Unoriginal Sin View Post

And that's perfectly fine... but the smartest approach to getting such a unit is not simply buying the highest output one you can afford, but buying the highest quality, highest end unit that will deal with such loads even if it does so at 100% load... because a high end unit at 100% load will still perform much better than a lower end one at 60% or 80% load. wink.gif
edit: generalization is the mother of **** ups, and there are of course exceptions to the above idea.. but the point still stands, you reach for higher quality and not higher output.


I think the AX850 accomplishes both nicely biggrin.gif
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post #36 of 59
Quote:
Originally Posted by svthomas View Post

Seasonic x750 Gold: http://www.newegg.com/Product/Product.aspx?Item=N82E16817151087&Tpk=x750%20gold
I am running SLI 680s and a 4.8- 5ghz 2500k on this same PSU.
If you wanted a bit of overkill, you could get an 850w, but I wouldn't go higher than that. Focus on getting a quality unit and you'll be fine. I would shoot for 750 - 850w, a 650w unit would be cutting it close, and you wouldn't be leaving much room for PSU degradation.

Please tell me how a 77w CPU (100 with OC)
and two 175 watt 670's (350w total)
plus hard drives, fans, etc (50w)
would be cutting it close on a 650? because my math shows 500w worst case scenario usage there (Furmark)

Real world gaming usage he is looking at around 400-450.
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post #37 of 59
Quote:
Originally Posted by Jayjr1105 View Post

Please tell me how a 77w CPU (100 with OC)
and two 175 watt 670's (350w total)
plus hard drives, fans, etc (50w)
would be cutting it close on a 650? because my math shows 500w worst case scenario usage there (Furmark)
Real world gaming usage he is looking at around 400-450.

Well... Since the 670 is a nerfed 680, and due to the lack of information about the 670 at this moment in time, I have been treating my recommendation as if the OP were buying SLI 680s. And as such, I have kept much of the same mindset as this:
Quote:
Here is Guru3D's power supply recommendation:

GeForce GTX 680 - On your average system the card requires you to have a 550 Watt power supply unit.
GeForce GTX 680 SLI - On your average system the cards require you to have a 750 Watt power supply unit as minimum.

http://www.guru3d.com/article/geforce-gtx-680-sli-review/4

I based my recommendation more on the basis of keeping the OP's hardware running healthily...so I am keeping my recommendation numbers safe. Don't forget to figure in PSU efficiency and possible degradation over the years into your calculations.
Edited by svthomas - 5/9/12 at 10:31am
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post #38 of 59
Quote:
Originally Posted by Jayjr1105 View Post

Please tell me how a 77w CPU (100 with OC)
and two 175 watt 670's (350w total)
plus hard drives, fans, etc (50w)
would be cutting it close on a 650? because my math shows 500w worst case scenario usage there (Furmark)
Real world gaming usage he is looking at around 400-450.

Ivybridge power consumption skyrockets with overclocking, especially when you get into the 4.7-4.8 range
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post #39 of 59
Quote:
Originally Posted by y2kcamaross View Post

Ivybridge power consumption skyrockets with overclocking, especially when you get into the 4.7-4.8 range
Ivy Bridge is not made for such clocks under daily usage.. the leakage is horrid... for 4.8 you need a pretty hardcore custom loop or benching fans on a high end twin tower air cooler.... what you should shoot for with ivy Bridge is ~4.4 Ghz @ <1.1v... otherwise you're far better off with Sandy Bridge if you're chasing 5Ghz clocks.
post #40 of 59
Quote:
Originally Posted by Jayjr1105 View Post

Please tell me how a 77w CPU (100 with OC)
and two 175 watt 670's (350w total)
plus hard drives, fans, etc (50w)
would be cutting it close on a 650? because my math shows 500w worst case scenario usage there (Furmark)
Real world gaming usage he is looking at around 400-450.

tdp doesnt = power consumption, also have we even actually confirmed the 670s power usage?
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