Why can I not get my 2 GTX 970's to SLI ?

elmetfano

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Sep 3, 2015
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4,510
Hello. I made an account to tom's hardware due to a huge problem I cannot troubleshoot on my own. My 2 GTX 970's are not the same brand and are as followed:
1) ZOTAC GeForce GTX 970
2) ASUS GeForce GTX 970.
I thought that so long as they are GTX 970's it would be fine.
Simple when I try to SLI in the NVIDIA control panel I get this:
SLI%20Grayed%20out.jpg

What I have tried.

  • 1) Uninstalling the drivers and reinstalling them using Display Driver Uninstaller (DDU)
    2) Calling NVIDIA, got no where
    3) connected the SLI bridge in every orientation possible

Are there any settings I could check? I already went to the system info in the NVIDIA control panel and see that both are running at the slower x8 bus speed.
Any help would be a huge help and I would be gratefully appreciated.

EDIT1: MOBO is Gibabyte GA-Z97X-SLI
I also observed that my SLI bridge is only one "prong" and the 970 seems to have 2 "teeth" on each of it's cards...do I need a bridge that can hit both "teeth?" cause my bridge only can hit one "tooth" on each GPU.
just a pic for the setup right now:
Sli%20setup.jpg
 
Solution
The second finger is for 3 way SLI. For 2 way you only need to use the bridge like the one you're using right now. It seems that nvidia control panel not detecting bridge being connected. Try using different bridge.

krells

Distinguished
This issue came up on the Nvidia forums and Zotac stated they only support SLI on identical SKU's. I have seen similar issues with EVGA cards too.
https://forums.geforce.com/default/topic/781585/sli/can-t-enable-sli-with-2x-gtx-970-updated-/1/

Zotac response:
Dear xxx,

Thank you for emailing Zotac.

We only guarantee SLI to work when all the cards are in the same GPU / Brand / Model / Type.

If the two cards are different model (different SKU), even when both are "Zotac" brand and same GPU, SLI may not work in such combination.

 

sammy sung

Distinguished
^^^ Pretty much what was said above. I've seen people get two different versions of EVGA 970's and not be able to SLI them. Really crazy things. But hey, I scored a really cheap 970 almost new a few months back because of that sillyness :p

*edit*

Thing to note, if you're ever going to SLI and want no headaches. Just get identical cards
 
You should get another GPU with the same SKU for SLI. There is an allowance on slight variants of certain cards with the same cooler, though. Example, you can get by with SLI'ing an EVGA GTX 970 SSC ACX 2.0 card with an EVGA GTX 970 FTW ACX 2.0 card. Both cards will run at the clock speed of the slower card; in that case, the SSC version.
 

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