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GTX 780 SLI power consumption

Last response: in Graphics & Displays
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July 1, 2013 3:30:48 PM

Hey everyone, I am ordering 2 gtx 780's to put into 2-way SLI mode and I am wondering what kind of PSU I should go with. I was planning on going with a 1000W PSU since I am going to be overclocking them and it would be nice to have the headroom. Any thoughts? Also, I am running them with an Intel i7-3770 processor at 3.4 Ghz. Do I need to worry about a CPU bottleneck with this?
July 1, 2013 3:47:26 PM

1000W PSU will be an overkill.At most a 800W or 850W will be sufficient considering you want to overclock them.
As you are using an i7-3770 there will be absolutely no CPU bottleneck.

P.S-On which resolution will you be using your 780's?
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July 1, 2013 4:23:05 PM

Just 1600x900, a larger resolution would be my next purchase.
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July 1, 2013 4:38:39 PM

That processor absolutely will bottleneck. I am using just one 780 and tried resetting my OC on my 3570k just to see what happened and FPS falls off the face of the earth in most every game.
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July 1, 2013 4:41:53 PM

One GTX 780 recommends a 600W psu. The card maxes at 250W so a sli setup would be good at 850W of a good psu (Antec, Seasonic, XFX to name a few). Make sure they have the two 8 pins and two 6 pins to power them.
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Best solution

July 1, 2013 5:26:12 PM

1st place to check should be maufacturer's web site:

http://www.geforce.com/hardware/desktop-gpus/geforce-gt...

Thermal and Power Specs:
Maximum GPU Temperature (in C) - 95 C
Graphics Card Power (W) - 600 W
Minimum Recommended System Power (W) - 250 W
Supplementary Power Connectors - One 8-pin and one 6-pin

600 + 250 = 850

Guru3D also does a great job in power testing .... pay attention to the part in bold
http://www.guru3d.com/articles_pages/gigabyte_geforce_g...

Quote:
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.

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July 1, 2013 5:42:56 PM

Locked processors should only be ran with a single video card because there's no way to alleviate the bottleneck
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July 1, 2013 7:52:09 PM

I am running 2 660 ti's in sli and have been experiencing no CPU bottleneck on the 3770. Granted, I know these cards are a lot less demanding, but it still makes me wonder.
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July 1, 2013 8:06:48 PM

Also, the turbo boost up to 3.9 ghz is pretty high for factory clock speeds. With overclocked cpus averaging around 4.5 ghz, wouldn't the bottleneck be extremely minor (if there even is one)?
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July 1, 2013 8:08:09 PM

AndrewEngelbart said:
I am running 2 660 ti's in sli and have been experiencing no CPU bottleneck on the 3770. Granted, I know these cards are a lot less demanding, but it still makes me wonder.


660 tis aren't in the same league as a pair of 780s
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July 1, 2013 8:20:44 PM

Intel God said:
AndrewEngelbart said:
I am running 2 660 ti's in sli and have been experiencing no CPU bottleneck on the 3770. Granted, I know these cards are a lot less demanding, but it still mam stakes me wonder.


660 tis aren't in the same league as a pair of 780s


I know they aren't in the same league, and I stated that I know that. But I am still skeptical if the i7-3770 will present me with any significant bottleneck issues at all. I agree as a general rule, locked cpus should be run with single gpu setups. But I am sure there are exceptions, and with it's high 3.9 ghz turbo boost, if any locked cpu could handle a multi gpu setup, it seems that the i7-3770 could do it. I guess I am just wondering if anyone has any personal experience running 700 series gpu's in sli on the i7-3770. Because at this point, a lot of the solutions I have seen seem like speculation. Does anybody know for sure?
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October 25, 2013 8:46:07 AM

Now I am bit confused.

I will very soon be purchasing (end of month) one GTX 780 [and later] SLi

(or [may now wait for] the GTX 780 Ti [later SLi])

...having completed my i7 4770 build with 16Gb RAM, and got an Asus 3D Kit 27-inch VG278H monitor, and am currently running HD7770 in Crossfire
(e.g. no stereoscopic 3D via AMD cards)

...and I have a Japanese (Teriki) Platinum 700 Watt PSU.

I had thought the AMPerage was what mattered, rather than Wattage? Mine has 58Amps to draw from....so.....

Will I have to go via the GTX770 4Gb route? Less Watts?

Or will the Amps be sufficient?

I forgot the Watts over Amps calculation thing....

I use a Samsumg Pro SSD on Windows 8.1 and put the games on a WD Black 1Tb HD.

Amps...

Do they matter?
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