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  1. #1
    ROG Member Array
    Join Date
    Jun 2015

    Which PCIE slot in one GPU configuration


    I have R6E mainboard and one ASUS GTX 1080 TI OC graphics card. The manual says to put it into the first PCIE slot. Unfortunately I cannot do that as my CPU cooler is too large. Can I put this card into the 4th slot? Will it work in x8 mode then or maybe I can change something in the BIOS to have x16?

    I tried the 4th slot and I have very high rates in benchmark, so it looks like there is no bottleneck. But my PC reboots randomly (in idle mainly) and I'm wondering if this may be the cause.

  2. #2
    Banned Array JustinThyme PC Specs
    JustinThyme PC Specs
    Laptop (Model)G752VY-DH72
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    ProcessorI9 9940X
    Memory (part number)64GB DDR4 8x8 Corsair Dominator Platinum 3800 MHz @ C17
    Graphics Card #1ASUS Strix 2080Ti O11G @ 2.1GHz
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    Join Date
    Nov 2013

    PCIe x16/x8_3 would be the other choice which is the 3rd full size slot, not counting the X4 slot.

    This will still give you X16 so long as you dont put anything in slot 2

    Click image for larger version. 

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  3. #3
    ROG Enthusiast Array thr23 PC Specs
    thr23 PC Specs
    MotherboardAsus ROG Rampage VI Extreme
    ProcessorIntel Core i7-7820X
    Memory (part number)G.Skill Trident Z RGB DDR4, 4x16GB, 3600MHz (F4-3600C17Q-64GTZR)
    Graphics Card #1Asus ROG Strix GeForce GTX 1080 Ti OC
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    Power SupplyThermaltake Toughpower iRGB PLUS 1250W Titanium

    Join Date
    Oct 2017

    Unfortunately, it looks like plugging your card into the 4th PCIe slot puts it in x8 mode. However, the real difference in speed between x8 and x16 is negligible, so you should be fine regardless.

    Your reboots may be unrelated, but are you getting bluescreens or something to help debug the issue? Make sure your BIOS and your drivers are up-to-date.
    Also, random reboots may be OC-related, so if you're overclocking much, maybe you could try toning it down a bit.

  4. #4
    ROG Member Array
    Join Date
    Jun 2015

    Thank you for your answers. The slot PCIe x16/x8_3 is indeed that I'm using. I don't know if it is working x8 or x16, but based on benchmarks results, this slot does not slow down my GPU.

    I have random reboots and I'm trying to narrow down the problem. I don't think it is a drivers problem, as sometimes the PC reboots from Windows and then it cannot go past BIOS - it just go into a reboot loop. Sometimes it reboots after several hours or even one day. I also tried almost everything in BIOS settings (default settings, OC turned on and off, etc.). Of course I have the latest BIOS version taken from this forum. I changed the whole RAM from Corsair to Kingston, changed the PSU and so on. The only things that I didn't change were: CPU and GPU. In the weekend I finally changed the GPU to my old one and since then - no reboots. I'm still waiting - maybe the restarts will finally happen, but if not, I will be wondering what is wrong. This can of course be a GPU, but I'm using this GPU in my old PC now and no reboots so far. Maybe the GPU wasn't fit tight enough in the PCIE slot? Or the PSU is malfunctioning, although it is a Corsair AX860i, so it should be fine. I suppose that this is a mainboard that I should RMA, but I still don't have enough proof for that.

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