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Help with new x79 deluxe and SLI (third slot wont SLI)

post #1 of 23
Thread Starter 
Hi, I received my ASUS x79 deluxe today, with an i7 4930k. And now I have a problem to run my GTX 780 in SLI.

I never had any trouble with the 780 in SLI with my previous motherboard, an ASUS P8Z77-WS.


I suspect the third PCI-E slot isn't working properly on the x79 deluxe.

If I plug my GTX 780s in the first PCI-E and the second PCI-E slot, everything works fine, and I can select SLI in the NVidia control panel.

However, when I use the first PCI-E slot and the Third PCI-E slot, the SLI option doesn't appear in the Nvidia control panel.


What can I do ? Do I have a broken mobo ? frown.gif




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post #2 of 23
Double check the BIOS settings and add a single 780 to the 3rd slot. See if it picks the card up.
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X79-GCN
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post #3 of 23
Thread Starter 
Quote:
Originally Posted by BradleyW View Post

Double check the BIOS settings and add a single 780 to the 3rd slot. See if it picks the card up.

Which BIOS settings should I be looking for ?
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post #4 of 23
Anything to do with the slots and how they run.
Try removing all GPU;s, then add a single a 780 to slot 3. If you get no signal, you may have a bad slot.
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post #5 of 23
Thread Starter 
Quote:
Originally Posted by BradleyW View Post

Anything to do with the slots and how they run.
Try removing all GPU;s, then add a single a 780 to slot 3. If you get no signal, you may have a bad slot.

I'm currently running a single gtx780 in the 3rd pci-e slot. So for a single card, it's working.

I'll go check the BIOS if I can see anything.
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post #6 of 23
Thread Starter 
There isn't many setting related to the PCI-E slots in the BIOS. What I found is this, all on stock, :



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SSD Crucial M4 256gb Corsair H80i Windows 8.1 64bit BenQ XL2420T 24'' 120Hertz (1920x1080) 
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post #7 of 23
ok

first congrats biggrin.gif

2nd it is normal we get stuff to work and tweak to get our system running perfect biggrin.gif

now about the gpu, Try re-installing the drivers and remove all profiles etc.. that is a check box when uninstalling them
and do install the drivers while the gpu.s in sli Make sure you are using the right slots on pcie ( manual )
3rd check if both cards working by running single each one then Try updating Bios as last option biggrin.gif, btw the Sli seems to be detected I never ran sli but in the settings it shows 2 Gpu's so I think they are already running sli you can check by Fps in benchmark for example run 1then run both together so check the Fps ,
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post #8 of 23
I have had the same problem with 3x 660Ti's .. I was never able to fully get 3 to work.

I have the Asus z87 dual deluxe mb.
first and second slot, sli no problem,
getting the third to sli, not happening.. dont know why.
even trying to sli, just using the second and third slot and leaving first empty doesnt work.



this is the pci info,
the one thing i never tried was, should of tried hard setting the first two to pcie gen 2 instead of auto.

Maybe try that.
post #9 of 23
Seems there was a new bios released for it not too long ago. Go to support, then Select your OS. Scroll down to Bios. Download the newest version

http://www.asus.com/Motherboards/X79DELUXE/#support

Check to see if you have the newest Bios first though:

http://www.asus.com/support/Article/563/


Always worth a shot, also you will have to download the Driver utility. Appears ASUS Motherboard flashing only works through DOS. doh.gif
post #10 of 23
Thread Starter 
Quote:
Originally Posted by mrWiggy View Post

I have had the same problem with 3x 660Ti's .. I was never able to fully get 3 to work.

I have the Asus z87 dual deluxe mb.
first and second slot, sli no problem,
getting the third to sli, not happening.. dont know why.
even trying to sli, just using the second and third slot and leaving first empty doesnt work.



this is the pci info,
the one thing i never tried was, should of tried hard setting the first two to pcie gen 2 instead of auto.

Maybe try that.

In the BIOS, what does GEN1, GEN2 and GEN3 mean? Is it there to manually set the PCI-E slots to PCI-E 1.0, PCI-E 2.0 and PCI-E 3.0 ?
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i7 4930k ASUS X79-Deluxe ASUS GTX 980 SLI Mushkin 16gb 1600mhz 8-8-8-24 
Hard DriveCoolingOSMonitor
SSD Crucial M4 256gb Corsair H80i Windows 8.1 64bit BenQ XL2420T 24'' 120Hertz (1920x1080) 
PowerCaseMouse
Corsair 850HX Antec 900 Razer Deathadder 
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My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 4930k ASUS X79-Deluxe ASUS GTX 980 SLI Mushkin 16gb 1600mhz 8-8-8-24 
Hard DriveCoolingOSMonitor
SSD Crucial M4 256gb Corsair H80i Windows 8.1 64bit BenQ XL2420T 24'' 120Hertz (1920x1080) 
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Corsair 850HX Antec 900 Razer Deathadder 
  hide details  
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