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EVGA GTX 980 SLI Requires PCI Slot 1 and Slot 3 ?

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Oregonboy
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Saturday, May 09, 2015 7:20 PM (permalink)
Hello, I upgraded my video cards from 2 GTX 780 to 2 GTX 980.   I had the 780s in SLI installed on slot 1 and Slot 2.
I installed the new 980s in slot 1 and slot 2 and my motherboard just cycles the post codes..no boot up.   Then I read the EVGA 980 installation instructions and it says to install in Slot 1 and Slot 3.  I did that and  now it works-I have not tried this in SLI mode yet because I have to get a new bridge because of the length.  
Just wondering why are these cards slot specific?  Does not make sense
 
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    Oregonboy
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    Re: EVGA GTX 980 SLI Requires PCI Slot 1 and Slot 3 ? Saturday, May 09, 2015 7:52 PM (permalink)
    The motherboard I am using is DX58SO2 and Slot 1 is PCIe 2.0 x16  Slot 2 is PCIe 2.0 x16 and Slot 3 PCI 2.0 x16 (x8 electrical).
    it is the x8 electrical I am curious about and now that I am running in Slot 1 and Slot 3.   The big question is why wont the 980 work in Slot 1 and Slot 2 just like the 780 did ?  Might be time for a new motherboard also?
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    Oregonboy
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    Re: EVGA GTX 980 SLI Requires PCI Slot 1 and Slot 3 ? Saturday, May 09, 2015 8:10 PM (permalink)
    OK I think there is some power limits on the motherboard.  Once I pulled the Sounblaster card out of one of the PCI slots I am able to now use both video cards in slot 1 and slot 2.  Anyone else have issues with this Intel motherboard and 980 sli? DX58SO2
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    Avenger411
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    Re: EVGA GTX 980 SLI Requires PCI Slot 1 and Slot 3 ? Saturday, May 09, 2015 8:15 PM (permalink)
    Hey,

    Since it's a x58 there must be a limit indeed as to what to board/cpu can allocate in terms of lanes. Hard to say it's old stuff but if it works as is, leave it this way.

    Max
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