SLI power configuration problems

Arismac · Nov 27, 2013

G'day all. I am trying to configure two GTX780 in SLI using a Gigabyte GA-X79-UD5 and a 1200W Thermaltake PSU. I plugged one pair of power cables to the red bus and one pair to the blue bus, but it is clearly wrong as I am only getting output from one of the two GPU cards. Current Nvidia driver is 9.18.13.3182.

Your assistance will be greatly appreciated..

Thanks and cheers,
Mac

alyoshka · Nov 27, 2013

Ok you're wrong or Are you?
What you need to do is connect the blues to one card as shown in this pic and connect the reds to the other card.
Not one Blue and one red.... nope

Meaning One V4 Blue 8Pin PCIe Connector and One V4 Blue 6Pin PCIe Connector to one card. And One V3 Red 8Pin PCIe Connector and One V3 Red 6PinPCIe Connector to the other card.

Another thing is have you enabled SLI in the NVCP? Have you connected the cards using the SLI Bridge?
And how have you concluded that only one GPU is working?

Arismac · Nov 27, 2013

Thank you for your reply. I have in fact connected one card to the Blue sockets and the other card to the Red sockets, so I got that right. I have also installed the bridge. But I have not enabled "SLi in the NVCP" More information needed for this newbie please?

alyoshka · Nov 27, 2013

NVCP... is the nvidia Control Panel.....
Check that out and get back.

Arismac · Nov 27, 2013

LOL. This is back to where I started. I can not find any way to turn the SLi on/off in the NVCP. I plugged a monitor into the second GPU and the screen remain black.

alyoshka · Nov 27, 2013

Have you tried the windows desktop configuration?

Arismac · Nov 27, 2013

This what I see in NVCP;

alyoshka · Nov 28, 2013

Post a screen shot of the systems information there.

Arismac · Nov 28, 2013

I hope this is what you asked for.

alyoshka · Nov 28, 2013

Ok , try a screenshot of the Control Panels Device Manager From MS, and show the Display Adapter expanded.

Arismac · Nov 28, 2013

alyoshka · Nov 28, 2013

Well,..... There seems to be just one card inserted and connected (Powered on ) in the rig.

Now would be a good time to take a pic of the setup of the internals of the rig with the connections on the GPUs and from multiple angels to be able to see what you have done (Physically) inside the rig and post them here. PSU power cables and connections inclusive.

Arismac · Nov 28, 2013

Will do, but I might not get them up here until tomorrow. I think we are close to the same time. Me Australia, you Japan?

alyoshka · Nov 28, 2013

Wouldn't you just love that.... lol
India
but hecks, we're still 'close'
LOL

Arismac · Nov 28, 2013

I am afraid that you will have to accept my word for the fact that the power is correctly attached because my camera is not available until the weekend. However I will take photo's on Saturday or Sunday and post them then.

I also have one SLi strap in place which is positioned at the far end from the power sockets.

alyoshka · Nov 29, 2013

It's ok, I've been here for more than 3 years... so I'll be around till saturday too....god willing.
That's the SLI bridge. Good.

Arismac · Dec 4, 2013

The problem has been resolved. I commenced fault finding by swapping the GPU's and not for the first time in my long life the problem vanished. I suspect that one of the two GPU's, the one from which I was not getting an output, was slightly loose in the MB slot. It seemed to come out a bit easily.

Thanks for your help.

alyoshka · Dec 5, 2013

Glad to hear that..

SLI power configuration problems

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