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  1. #1
    ROG Member Array Fahrenhe1t PC Specs
    Fahrenhe1t PC Specs
    MotherboardASUS ROG STRIX z270G Gaming
    ProcessorIntel 7700K 4.2GHz @ 5GHz
    Memory (part number)64GB Corsair Vengeance LPX 3200MHz DDR4
    Graphics Card #1ASUS Turbo GTX 1080 8GB x2
    MonitorASUS ROG SWIFT PG278QR 27" 165Hz
    Storage #1Samsung 960 EVO NVMe M.2 500GB
    Storage #2Samsung 960 EVO NVMe M.2 1TB
    CPU CoolerCorsair H100i v2
    CaseCorsair Air240
    Power SupplyCorsair HX1000i 1000W
    OS Windows 10 Pro 64-bit
    Fahrenhe1t's Avatar
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    Question PCI-E Lanes Used Up?

    I have a ROG STRIX z270G Gaming motherboard; it's got two full-size PCI-E slots (16-8x), two 1x slots, and two m.2 slots. I have an Intel 7700K CPU installed (which has 16 PCI-E lanes).

    • I recently installed two ASUS GTX 1080 Turbo cards in the extended slots (SLI mode)
    • I have two Samsung NVMe 960 drives installed in both m.2 slots (they default to 4x)
    • I recently got an HTC Vive wireless PCI-E 1x card

    I'm waiting for a 1x PCI-E extender to plug in the wireless Vive card. However, I started thinking about PCI-E lanes. With all that hardware installed:

    1. Will I have enough lanes to run everything?
    2. What speed will the graphics cards run at? 8x and 4x?
    3. If the graphics cards run at 8x and 4x, would that slow them down?
    4. Will both m.2 cards and the wireless Vive run at 1x?


    Thanks!
    Last edited by Fahrenhe1t; 10-26-2018 at 08:26 PM.

  2. #2
    ROG Guru: Grand Master Array HiVizMan's Avatar
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    The GPU will run at 16x and 8x depending on the work load. The motherboard/CPU will allocate priority to PCI lanes as the task demands.

    As long as your new card is on a x1 lane it will not have any effect on your GPU performance.
    To help us help you - please provide as much information about your system and the problem as possible.

  3. #3
    ROG Member Array Fahrenhe1t PC Specs
    Fahrenhe1t PC Specs
    MotherboardASUS ROG STRIX z270G Gaming
    ProcessorIntel 7700K 4.2GHz @ 5GHz
    Memory (part number)64GB Corsair Vengeance LPX 3200MHz DDR4
    Graphics Card #1ASUS Turbo GTX 1080 8GB x2
    MonitorASUS ROG SWIFT PG278QR 27" 165Hz
    Storage #1Samsung 960 EVO NVMe M.2 500GB
    Storage #2Samsung 960 EVO NVMe M.2 1TB
    CPU CoolerCorsair H100i v2
    CaseCorsair Air240
    Power SupplyCorsair HX1000i 1000W
    OS Windows 10 Pro 64-bit
    Fahrenhe1t's Avatar
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    Mar 2017
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    Quote Originally Posted by HiVizMan View Post
    The GPU will run at 16x and 8x depending on the work load. The motherboard/CPU will allocate priority to PCI lanes as the task demands.

    As long as your new card is on a x1 lane it will not have any effect on your GPU performance.
    Cool thanks!

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