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Can i SLI Asus dcuii 780s on a good 750w PSU?

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  • Power Supplies
  • Graphics Cards
  • Graphics
Last response: in Graphics & Displays
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August 5, 2014 12:00:27 PM

Hey all, I'm looking to upgrade to a 1440 monitor soon and am considering adding a second DCUII 780. I currently have a 750w PSU. I believe this would be sufficient but am unsure. Can anyone tell me if this is enough?

Also, does anyone run SLI 780s on 750w?

See system specs below.

PSU: Seasonic x750
Case: Phanteks Enthoo Primo
Fans: 4 140mm, 2 140mm w/ LED
CPU cooler: H80i w/ 2 120mm fans
CPU: i7 4770k
RAM: 2 8Gb Sticks
MOBO: Rog vi Hero
Ssd: Intel 530 250gb
2 usb devices max at any time.

Thanks all!

More about : sli asus dcuii 780s good 750w psu

August 5, 2014 12:10:09 PM

For a system using two GeForce GTX 780 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 850 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 65 Amps or greater and that has at least two 6-pin and two 8-pin PCI Express supplementary power connectors.

so the answer would simply be no.
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August 5, 2014 12:10:18 PM

Should be enough, but don't try to overclock anything; The recommendation for GTX 780 SLI is 850W, so a high quality 750W should do (it's going to put a strain on the PSU though).
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August 5, 2014 12:12:09 PM

to be more specific, you need at least 65 amps on the 12volt rail to run sli 780's.
your PSU only has 62.
you're going to need to find a PSU with 65 amps on the 12volt rail and 2x 6pin pci and 2x 8pin pci connectors.
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August 5, 2014 12:13:03 PM

Eduello said:
Should be enough, but don't try to overclock anything; The recommendation for GTX 780 SLI is 850W, so a high quality 750W should do (it's going to put a strain on the PSU though).


it should not be enough, since his PSU only outputs 62 amps on the 12volt rail, and for sli 780's, you need a minimum of 65 amps on the 12volt rail.
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August 5, 2014 12:19:24 PM

Kendo4life1 said:
Eduello said:
Should be enough, but don't try to overclock anything; The recommendation for GTX 780 SLI is 850W, so a high quality 750W should do (it's going to put a strain on the PSU though).


it should not be enough, since his PSU only outputs 62 amps on the 12volt rail, and for sli 780's, you need a minimum of 65 amps on the 12volt rail.


That is an estimate, two of those cards need 500W at most, meaning that you still have about 250W for the rest of the system. That's enough, but as I said, it'll put a strain on the PSU to run it so close to its maximum potential.
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August 5, 2014 12:22:28 PM

Eduello said:
Kendo4life1 said:
Eduello said:
Should be enough, but don't try to overclock anything; The recommendation for GTX 780 SLI is 850W, so a high quality 750W should do (it's going to put a strain on the PSU though).


it should not be enough, since his PSU only outputs 62 amps on the 12volt rail, and for sli 780's, you need a minimum of 65 amps on the 12volt rail.


That is an estimate, two of those cards need 500W at most, meaning that you still have about 250W for the rest of the system. That's enough, but as I said, it'll put a strain on the PSU to run it so close to its maximum potential.


it's not about the total power of the PSU, its about the 12volt rail (do you even know what that is?)
2x 780 takes 65 amps on the 12volt rail as a minimum, his PSU only gives off 62, so it just won't run.
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August 5, 2014 12:34:03 PM

http://www.geforce.com/hardware/desktop-gpus/geforce-gt...
As you can see, a single GPU can use up to 250W of power, so two of them can use 500W.

http://www.seasonicusa.com/X.htm
As you can see, that PSU has 62A or 744W on the 12V rail. That leaves 244W for the rest of parts that need the 12V rail.

Those GPUs won't use 65A on the 12V rail, that's an estimate made by Nvidia, and that estimate includes every other part of the PC as well. Or did you really think that two graphics cards would take 65A or 780W on their own?
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August 5, 2014 1:28:13 PM

http://www.guru3d.com/articles-pages/gtx-780-ti-sli-gef...

i7-3960X Extreme Edition Sandy Bridge-E overclocked to 4.60 GHz on all cores / 2x gtx780 ti

System in IDLE = 129W
System Wattage with GPU in FULL Stress = 617W
Difference (GPU load) = 488W

so an excellent psu like seasonic x 750w can handle such load. however adiitionally overclocking both gtx780 will further increase consumption, so you better not try any! As Eduello said, running a psu maxed out cant be recommended!
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