3 way sli issue Rampage IV Extreme Edition and 3x 780ti - middle card not enabled in Nvidia control panel!

TheBorgli

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Jan 20, 2015
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Hi.

I am having trouble connecting 2x MSI 780 ti and 1x ASUS 780 ti in three way SLI.
I have them daisy chained because of the MSI's stupid cooler design. I connected card 1-2. 2-3 and 1-3 together.

However, in Nvidia control panel when I activate SLI, only cards 1 and 3 are enabled. (the ASUS being the 1st and MSI the 3rd, so there is no comparability issue) There is also a little exclamation mark inside a triangle telling me: "For optimal 3D performance, connect the SLI-ready graphics cards with an SLI connector."

I am guessing that the problem lies with the second PCI-e lane, but the MB is 4 way SLI ready...

Specs:

ASUS Rampage IV Extreme Black Edition
Intel 4930K @ 4.5ghz
16gb of Corasir Vengance 1600mhz
1000w HX powersupply

Any advice is appreciated!

- TheBorgli
 

Illuminations

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Mar 16, 2014
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Does the cards have the same amount of VRAM and the same bus lenght?
If so, there shouldn't be a problem. However, if it's different, then SLI will not work.

If the cards basically are identical, try swapping them around, change SLI-bridges or look for any visual damage.
Or just run one card in the very slot you suspect might be faulty.

Good Luck!
Axel.
 

TheBorgli

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Jan 20, 2015
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They are identical, I can run the ASUS and the MSI card in 2 way sli.
I tied to only connect the 1st and 2nd card and I had no SLI, so it seams like there is an issue with the second x8 lane. I just find it strange that is shows up and that I can use it as a Physx card...
 

Illuminations

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Mar 16, 2014
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Well, as I said, try using only one card in the suspiciously faulty PCI-lane and see if the same issues occur.
The fact that it shows up though; Is indeed strange.
Have you changed anything in BIOS? Or see if you can find anything that isn't correct in there.

Good Luck!
Axel.
 

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