Can't enable SLI/No SLI Option in Nvidia control panel

RealProlix · Aug 22, 2014

I have 2x GTX 770's from Galaxy and asus respectively, however when i go to the Nvidia control panel, there is no SLI option there! My motherboard is SLI enabled (MSI Mpower Max) And they both have the same amount of memory! What's wrong?

faalin · Aug 22, 2014

1) are both showing up in device manger?
2) if yes do you have the sli bridge connected to each card?

if both of those are a yes try another sli bridge from a know working setup.

RealProlix · Aug 22, 2014

Both show up in device manager and the nvidia control panel! Even in GPU-Z! Do you need the sli bridge? I do have one, but it may be faulty! It seems, though, that they are running differently! The newer one runs only at 4x and the old one at 8x. Is that a problem?

sincreator · Aug 22, 2014

It sounds as if you have one of the cards in the wrong slot. You should be running 8x and 8x for SLI on that board for a 2 way configuration. It will be 8x 4x 4x for a tri SLI setup. http://www.msi.com/product/mb/Z87_MPOWER_MAX.html#hero-specification Look at the PCI-e gen 3 column. It says 8x 8x or 8x 4x 4x.

ubercake · Aug 22, 2014

You do need the SLI bridge. I've had the best success by installing the two video cards booting up and letting the system recognize both cards, then shut down and put the SLI bridge on, then restart and enable SLI.

faalin · Aug 22, 2014

depending on how you have your cards plugged into the motherboard... the older one plugged in closer to the cpu. your motherboard my run 16x with one card and 8x,4x with two cards plugged in. without knowing what you motherboard is that would be my guess

Some motherboard do allow you to run sli with out the bridge, they just send the signal through the pci-e lanes. But 99% of the time you will need a bridge to enable sli. Turn off your computer and plug the sli bridge in, if there are two slots it doesn't matter witch one you use just make sure you use the corresponding one on the other card.

RealProlix · Aug 22, 2014

sincreator :

It seems both the extra slots run at 4x. Actually, would a soundcard in one of the slots make a difference?

17seconds · Aug 22, 2014

I have heard that SLI disables itself when the PCIe slot is running at x4 mode.

sincreator · Aug 22, 2014

RealProlix :

Hmm if all 3 PCIe 3.0 slots are populated then your second card will only run at 4x. Maybe try removing the sound card if you have one and see if it changes anything.

faalin · Aug 22, 2014

just looked up your board if you have all 3 pci-ex16 populated then the cards will run 8x, 4x, 4x so your sound card in the very bottom pci-ex 16 slot is slowing down your second card to 4x

RealProlix · Aug 22, 2014

faalin :

I have an MSI Mpower Max z87 Motherboard. I have tried with the bridge too, but it still doesn't work! Can it be the sound card in the last x16 slot?

RealProlix · Aug 22, 2014

sincreator :

RealProlix :

Hmm if all 3 PCIe 3.0 slots are populated then your second card will only run at 4x. Maybe try removing the sound card if you have one and see if it changes anything.

Wow. you guys are quick! I will try the sound card thing! Give me a minute!

RealProlix · Aug 22, 2014

Thank you guys so much! Switched them around and it works!

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