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  1. #1
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    X99 STRIX Gaming - PCI x16/x16 SLI - x4 NVME Drive

    Hi all,

    Wondered if you could advise if I'm doing something boneheaded.

    I've got a STRIX X99 GAMING mobo, Core i7 6850K (40 lanes), 2x GTX 1080 cards, 1x 1.2TB Intel 750 Series NVME (PCI-E) and a Sound Blaster Zx (PCI-E) audio card.

    If I populate it with :-

    GTX 1080 - PCIEX16/X8_1
    N/A (covered up) - PCIEX1_1
    Audio Card - PCIEX4_1
    GTX 1080 - PCIEX16_2
    N/A (covered up) - PCIEX1_2
    750 Series - PCIEX8_3

    My SSD will run @ Gen 3.0 x8 and perform properly in Windows.

    This is the suggestion as per the ASUS manual for SLI

    "Dual VGA/PCIe cards x16 x16 N/A"

    But it also says

    Triple VGA/PCIe cards x8 x16 x8


    And that's what I'm being plagued with. My GPU POST shows the first PCI-E card running @ x8 with the second @ x16. GPU-z confirms this too.

    If I swap the sound card and NVME drive - the drive performs at x2 speeds (so it runs at half speed, effectively) or maybe full if its a Gen 2.0 slot? - but the GPUs are read correctly - both @ x16.

    Any ideas fine people?

    Tom

  2. #2
    ROG Guru: Yellow Belt Array Legolas PC Specs
    Legolas PC Specs
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    Maximum 40 lanes PCI for your setup. However, your setup is 16x+4x+16x+8x= 44 lanes total. 44 is above 40, so it will reduce one of your PCIE to 8x so 8x+4x+16x+8x=36. 36>40.
    You need to take out of your cards or your GPU will slow down.

  3. #3
    Moderator Array Nate152 PC Specs
    Nate152 PC Specs
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    Hi guys

    By adding more pcie devices that would seem right for one of the gpu's to drop to x 8, I would have the dive where it's running full speed.

  4. #4
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    Quote Originally Posted by Legolas View Post
    Maximum 40 lanes PCI for your setup. However, your setup is 16x+4x+16x+8x= 44 lanes total. 44 is above 40, so it will reduce one of your PCIE to 8x so 8x+4x+16x+8x=36. 36>40.
    You need to take out of your cards or your GPU will slow down.
    The NVMe is (was) x4 though. This isn't being read correctly, that's where I believe the issue lay.

    I'm fortunate to be in the hardware business and as this is my personal box, I moved the STRIX on and I've got a Deluxe II now - this works perfectly.

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