GTX 780 SLI power supply

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RyviusRan

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Jul 26, 2009
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I was wondering if this power supply would be enough for a GTX 780 sli setup.

EVGA SuperNOVA NEX750B

It may only be 750watts but it is an 80amp PSU.


I will be using Haswell but probably only OC it to around 4.0ghz for now.
Add in;
two Western Digital black hard drives
Asus Xonar DG sound card
CM Storm Trooper case
Phanteks PH-TC14PE_BK 140mm UFB CPU cooler

 
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toyftw

toyftw

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Jul 29, 2012
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Hi - You can try it, it might be OK. You are cutting it a little close. Altho
that PSU does have 4 - 20a, +12v rails, there is not 80a +12v amps
available combined. The combined +12v rail avail amps is 61 which is quite
a bit short of 80.

http://www.realhardtechx.com/index_archivos/Page2293.htm

I glanced at a review of EVGA gtx780 in SLI and the system power consumption
under load was 755w (63a)

http://www.tweaktown.com/reviews/5507/evga-geforce-gtx-780-3gb-superclocked-video-cards-in-sli/index22.html

There is no review of it from the trusted PSU review sites, of this particular PSU.

I wouldn't risk it.
 
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JackNaylorPE

JackNaylorPE

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Oct 30, 2004
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http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-780/specifications

Graphics Card Power (W) = 250
Minimum Recommended System Power (W) = 600
Click to expand...

Total 850 minimum according to nVidia

http://www.guru3d.com/articles_pages/gigabyte_geforce_gtx_780_windforce_oc_review,7.html

Here is Guru3D's power supply recommendation:

GeForce GTX 780 - On your average system the card requires you to have a 550 Watt power supply unit.
GeForce GTX 780 2-way SLI - On your average system the cards require you to have a 800 Watt power supply unit as minimum.
GeForce GTX 780 3-way SLI - On your average system the cards require you to have a 1200 Watt power supply unit as minimum.

If you are going to overclock your GPU or processor, then we do recommend you purchase something with some more stamina.
Click to expand...
 
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hunter315

hunter315

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May 12, 2009
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For a single GPU it is plenty; however, it is NOT 80 amps, it has 4 12V rails each current limited to 20A, but their combined current limit is only 61A(732W). The ratings on rails are like circuit breakers in your house, each one has its own limit, but the combined power pulled through all of the smaller ones must be less than the limit imposed by your main breaker.

Since each 780 pulls about 250 W, a 750 W power supply starts pushing the limits a bit, you would be better off with an 850 W unit as each 780 will be pulling 21 A from the 12 V rail by itself, the CPU will pull about 10 which puts you at 52 A from the 12 V rail, 9 amps may or may not be sufficient to run the rest of the system depending on what you are running.
 
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R

RyviusRan

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Oops meant to post a different one.

All of those previous ones plus these are within my price range.
Just trying to figure out which one is the best to get.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817116016

http://www.newegg.com/Product/Product.aspx?Item=N82E16817207011

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151108


I was thinking about this one because there was a deal for it but it is sold out now...

http://www.newegg.com/Product/Product.aspx?Item=N82E16817341026
 
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