sli problems

Discussion in 'Videocards - NVIDIA GeForce' started by brian19876, Aug 21, 2015.

  1. brian19876

    brian19876 Member Guru

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    i just installed a second 980 ti and now getting on average 15-20 fps less than i did with a single card anybody ever see this happen im gaming 5880x1080 three monitors
     
    brian19876, Aug 21, 2015
    #1
  2. Timesgodjillion

    Timesgodjillion Member Guru

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    It helps if you tell us what games or benchmarks you're trying to run...
     
    Timesgodjillion, Aug 21, 2015
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  3. CK the Greek

    CK the Greek Maha Guru

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    There are games that run worse on multi gpus (like Batman AK for example). Give more info.
    Which ones did you test ?
    Current single vs SLI results ? ( I mean now with two gpus installed)
     
    CK the Greek, Aug 21, 2015
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  4. Netherwind

    Netherwind Ancient Guru

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    Are your specs updated?
     
    Netherwind, Aug 22, 2015
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  5. brian19876

    brian19876 Member Guru

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    Still have 2500k at 4.8
    1200 corsair power supply
    2 980ti hybrid in sli

    Witcher 3
    Heaven benchmark
     
    brian19876, Aug 22, 2015
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  6. ---TK---

    ---TK--- Guest

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    Is this your first sli setup? If so every time you install a new driver sli is disabled by default. You can also select the sli indicator in the nvcp so It will be a green vertical line on screen to the left, the more sli is humming the bigger the line will be.
     
    ---TK---, Aug 22, 2015
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  7. brian19876

    brian19876 Member Guru

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    No I had 580 3gb in sli before this setup it is definitely enabled
     
    brian19876, Aug 22, 2015
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  8. CK the Greek

    CK the Greek Maha Guru

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    Uninstall Nvidia drivers using DDU(when it asks about safe mode click yes) and install again.
     
    CK the Greek, Aug 22, 2015
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  9. Shadowdane

    Shadowdane Maha Guru

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    The biggest thing would be to verify they are both running at 8x PCIe speeds. I had once where one card wasn't seated well and only ran at 4x speeds.


    Also if you have other PCIe devices I've seen it drop the speed on one card down to 4x.

    When I first tried SLI with a GTX680 at the time I had a PCIe Soundcard & PCIe video capture card. With those installed and the 2nd video card it would only get 4x bandwidth on the 2nd GPU which made performance horrible!! I removed the video capture card and it booted up at 8x speeds on both.


    Also check for dust build up in the PCIe slots, Ive seen heavy dust prevent a 8x or 16x connection before if the slot was unused for a while.
     
    Shadowdane, Aug 26, 2015
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