PCIE slot_2 not working? with new graphics cards

Hi there guys, Yesterday i bought 2 evga 3gb GTX 660ti SC's to run in SLI.

I installed both cards together in the 2 PCIE 3.0 slots that my mobo has. When i turned my computer on I immediately updated my NVIDIA drivers to 320.18 with a clean install. I then tried enabling SLI in the NVDIA control panel under 3D settings, but the option wasn't there. This was because the 2nd card was not recognised. It was not recognised in the Device Manager>Display area as well.

Since the first card in PCIE_1 slot was working fine i tried it in PCIE_2 slot on its own and no success. I then Used driver sweeper in safe mode to do a clean uninstall, and uninstalled all my drivers from the device manager, and uninstalled all NVIDIA software in the windows program list. Nothing worked still. I can run both cards in PCI 3.0 and another in PCIE 2.0 which my computer recognizes, however when i use the SLI bridge it still cant enable it in NVIDIA CP, also one would run at 16x and other at 4x so theres no point.

I then Updated my mobo's Bios to the latest update then I made it go to all the Default settings. and this still didnt work. The mobo could not find the card in PCIE_2 slot as well. I then took the battery out of the Mobo for a while to reset it and still no success. Ive even tried rolling back to previous drivers with out any luck. I gota gtx 650ti lieing around i could probly try as well. I could RMA the mobo however its a tedious part to replace so i rather look for a solution first. Is there any way i can get my PCIE 3.0 slot 2, to recognise any of my new graphics cards?

my specs are
i5 3470 @ 3.2 GHZ:
Asus P8Z77-M PRO Motherboard
G.Skill 16 GB 1600 MHZ RAM, ( which only shows up as 8gb in the bios/windows..)
2x EVGA GTX 660ti SC
Corsair GS800 800W Powersupply @ 66amps on 12v rail
Intel 520S 180 GB SSD
Seagate 1tb 7200 rpm hdd
Asus VE247H 1080p monitor
3 answers Last reply Best Answer
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  1. Best answer
    I'd bet your 2nd PCIE slot is bad.
  2. While reading the new July 2013 edition of Maximum PC that came today, I saw this solution in the FIX IT section. I thought of you so I am posting it below copied word for word from the Maximum PC magazine. Be careful when messing with the registry. Here's the solution:

    Problem: Optical Drive Disappears

    Solution: This classical conundrum involves either a missing drive or one that stops functioning suddenly. Put on your big-boy pants and type regedit in the Start menu search box, then navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}. If you see an entry named UpperFilters, delete it. If you see an entry named LowerFilters, delete it. Once you’ve done this, exit Regedit and reboot your system. In most scenarios, your optical drive will reappear and/or magically begin working again. Note that you may have to reinstall software that accesses the optical drive (e.g., burning software) to get back to 100 percent functionality.

    Maybe try the above solution, shut down your comp and set up your two graphics cards in SLI and then boot up and see what happens.
  3. Sorry, I copied the completely wrong "FIX IT" solution from Maximum PC magazine in my previous post.

    Here's the Maximum PC Solution:


    SOLUTION: First, make sure that you are running the latest drivers. Many Systems that are running the default Windows drivers have issues with this. Second, make sure you have gone into the control panel of the drivers to enable the second display. Third, some DVI ports do not work if you are using a VGA-DVI adapter, so if there are two ports on your card, try them both. If you have everything set normally in the drivers, make sure your Windows settings are configured properly and that you have multiple displays enabled.

    Hope you can get a fix from this!
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