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So basicallly, I got a brand new px8z77-pro motherboard. All the pcie slots work appart from slot 2. Im trying to run Sli with my two gtx 680 and due to this problem, I am not able to.

My power supply is a corsair hx1050 and I'm running Windows 8 with a core i7 3700k. I tried to swap them around and the GPUs both work when they are not inserted in the pcie slot 2.

After reading lots of forums on the internet, I tried various solutions. One, which was of unsinstalling all of the nvidia drivers, clear the CMOS and reinstall the driver. That worked until I restarted the pc, then the problem came back again.

Any suggestions on what to do?

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Does slot 2 work if it you run with a single GPU plugged into it, or only when you try to SLI? – Ash Mar 31 '13 at 7:49
@Ash both, it doesnt recognize any video cards that are inserted in it. All of the others work apart for the 2nd pcie – Alessandro Miotto Mar 31 '13 at 15:20
There's always the possibility that it's faulty. If the suggestions below don't work, you may need to get a replacement under warranty. – Ash Mar 31 '13 at 22:56

Your question isn't 100% clear but I will attempt to answer anyway

When you say the card in the second slot doesn't work - does the fan spin up, lights come on, etc? Are you expecting it to output a signal when connected to a monitor? AFAIK only the primary card will output a signal by default and you will need to configure this in software.

If you specify this information, others will be able to provide better answers.

  1. Ensure that you have installed the SLI bridge.

  2. Check that the second slot is enabled in the BIOS. Specifically, have a look at NB PCIe Configuration under the Advanced tab.

  3. Excerpt from the PX8Z77 manual: From the NVIDIA Control Panel window, select Set SLI Configuration. Click Enable SLI and set the display for viewing SLI rendered content. When done, click Apply

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yes, the fan works and all but the card isnt displayed under device manager and in the bios under the pcie page – Alessandro Miotto Mar 31 '13 at 15:09
im not sure where to go in the bios. Because its a uefi bios. – Alessandro Miotto Apr 1 '13 at 7:56
@AlessandroMiotto What's so special about a UEFI BIOS? Do you mean it is in "EZ Mode"? Press F7 in the BIOS to enter advanced mode. – bhillam Apr 1 '13 at 8:22
@bhilliam oh sorry thought u were talking about normal bios. in nb pcie configuration, u cant do a lot of stuff.... just change "gen". But on pcie 2 its says disabled/empty even if my card is inserted – Alessandro Miotto Apr 1 '13 at 19:23
@AlessandroMiotto, As a sanity check before returning the motherboard, try loading the BIOS optimised defaults (F5) – bhillam Apr 2 '13 at 3:53

Recheck the card to slot number orientation for install per the manual.

If the cards are in the correct slots, you may be wise to return/exchange if you are still within that time span. Defects are possible and you may not want to invest too much time on it.

slots pci slots

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