SLI Nvidia 670 gtx's issue

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matrimforever

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Jan 9, 2012
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Hi,
MSI 970 Gaming mobo
Nvidia 670 gtx's x2
AMD FX-8320
Win 10
PSU 850 W
Raided Corsair 240 gb x2 SSD's

It seems I have them installed correctly and once the driver is installed, both cards show up in Device manager. However, everytime I try to enable SLI by clicking the Enhance 3d Performance box in Nvidia Control Panel, it hangs it and the driver gets either corrupted or uninstalled. Each time I try I have to reinstall the driver and reboot.

What are some things to try or check for? I looked in the BIOS to see if SLI needed to be enabled there but couldn't find anything. I've done a fresh install of Win 10, and against all hope with nothing else installed, it failed again :(
 
Solution
WildCard999
I don't think its the graphics card fan unless its overheating which I doubt because you said its running. I know this is probably a stupid question but are you sure there plugged into the correct PCIE slots? Top GPU should be in PCIE slot 2 and the second GPU should be in PCIE slot 4, those are the only slots where the graphics cards can be used in SLI. ***Actually looking at the MB I don't think the graphics cards will even fit in those other slots.

http://www.newegg.com/Product/Product.aspx?Item=N82E16813130790

Just to let you know the graphics cards did both show up in Device Manager even though one slot was defective. If everything is installed correctly I would just order another SLI bridge or borrow one from a friend to try...
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matrimforever

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Hmm, I thought I'd get a response by now heh. Anyone have any suggestions? I updated the BIOS and tried moving the Bridge around. Could the bridge be bad? I couldn't see any known issues with that mobo and SLI, so a little stumped.

:(
 
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WildCard999

WildCard999

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Jul 18, 2014
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Not sure if this will help but here we go:
- Possibly a bad SLI bridge
-Clean install of Nvidia drivers (could also try to update drivers via Device Manager).

I had a similar issue awhile ago on a MSI MB (MSI Z87 M-POWER) that SLI had stopped working and even though the MB recognized both cards, SLI would not work correctly (BSOD and graphic errors). I had thought it was the GPU's but EVGA tested them out and there wasn't an issue with them. The issue turned out to be a semi-defective PCI-E slot, working just enough that the GPU showed up but SLI was messed up, caused possibly due to the fact I never plugged in the additional power supply plug into the MB (it was a 6-pin connection in addition to the 24-pin main power unit).
 
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matrimforever

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Jan 9, 2012
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Thanks for the suggestion of Nvidia drivers, but I've tried that already. It probably is a bad bridge. I don't think it's defective hardware(as far as PCI slot) as everything seems to be showing properly in DM. It just crashes in Nvidia Control Panel when attempting to turn SLI on. :(

Could it be a bad fan? The 2nd card's fan is spinning but making a little noise. The fan connector is 4 pronged and connected to a 3-prong connector on the mobo(the first card is plugged correctly).

I can't think of anything else it could be :(.
 
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WildCard999

WildCard999

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I don't think its the graphics card fan unless its overheating which I doubt because you said its running. I know this is probably a stupid question but are you sure there plugged into the correct PCIE slots? Top GPU should be in PCIE slot 2 and the second GPU should be in PCIE slot 4, those are the only slots where the graphics cards can be used in SLI. ***Actually looking at the MB I don't think the graphics cards will even fit in those other slots.

http://www.newegg.com/Product/Product.aspx?Item=N82E16813130790

Just to let you know the graphics cards did both show up in Device Manager even though one slot was defective. If everything is installed correctly I would just order another SLI bridge or borrow one from a friend to try, hopefully that was the issue.
 
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Solution
WildCard999

WildCard999

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Another thing to try is to put each GPU into both PCIE slots individually to find out if its a defective PCIE slot. So take out both GPU's then install only one in the top slot then play a game, if it runs fine then move it to the lower spot. If it runs fine then take the second card and do the same with each slot with the first GPU out. If a game runs horrible in one of the slots and you try the other one and you get the same crappy performance then it means the slot is bad. You could also use this method to find out if the GPU is bad. Other then the SLI bridge possibly being defective this is really the only thing left to do considering you've pretty much exhausted all other options like driver reinstall, OS reinstall, MB updates, etc.

If the MB is defective then you will want to call MSI and get a replacement (hopefully its still under warranty).
 
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WildCard999

WildCard999

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Reading through some other articles I saw that a lot of ppl ran into similar issues when either the GPU or CPU was overclocked, if your system has any overclocked parts reset them to default. Then go into power options and set it for "High Performance", once that is done try to enable SLI again.
 
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