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  1. #1
    ROG Junior Member Array
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    Jul 2015
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    2nd pcie slot not working maximus viii hero

    Hi,

    I have an Maximus VIII Hero that the 2nd pcie slot didn't recognized anything. There's the full system specs:

    -Maximus VIII Hero motherboard
    -Intel core i7 6700K
    -16GB RAM G-Skill 3200mhz
    -Corsair RM650 PSU
    -Nvidia Geforce GTX 1070 (X16 slot)
    -GPU tryied on the 2nd slot: EVGA Geforce GTX 660, Sapphire pulse RX580, Powercolor RX 5700xt

    The first pcie slot work fine, without any issues, whit any gpu. The X8 slot didn't recognize anything. Here's what i've tryied:

    -First, read the motherboard specs and user manual to be pretty sure that this board can accept 2 GPU, this is the case
    -Clear the cmos, didn't touch any bios setting: Not recognized
    -Put PCIE to Gen1, activate above 4G decoding, didn't work
    -Remove PSU cable from the gpu, power on the pc to confirm that the fan spin, this is the case, so there's power inside the pcie slot.
    -Tryied to put 2nd gpu on the X4 Slot (chipset) that work
    -GPU isn't recognized in the bios, and on the os (Both linux and windows)
    -All of my gpu is working pretty fine on the first slot and the x4 slot, and in other computer

    In the bios and manual, they said to use X8 slot for a 2nd gpu, but that didn't work. I'm doing computer troubleshooting and fix since many years but this one, i can't find the issue, so any help would be appreciated. I have an older board (P8Z77-V Deluxe) and this board accept any gpu on the 2nd slot. I didn't understand why a cheaper and older board accept it, but not this one.

    Thank you

  2. #2
    ROG Guru: Orange Belt Array raju2529 PC Specs
    raju2529 PC Specs
    Laptop (Model)R542UQ-DM153 ( X542UQ.309SA )
    MotherboardAsus Builtin Motherboard X542UQ
    ProcessorIntel core i5 7200u @2.5Ghz
    Memory (part number)Adata 2400 Mhz 16GB DDR4
    Graphics Card #1intel HD 620 graphics 1GB DDR3 DCH WHQL driver v.30.0.101.1121 Beta
    Graphics Card #2Nvidia GeForce 940MX 2GB GDDR5 DCH WHQL driver v30.0.14.9676
    Graphics Card #3nil
    Graphics Card #4nil
    Sound CardRealtek HD Audio controller with codec ALC294 WHQL driver v10.0.22000
    MonitorBuiltin Lcd monitor model BOE
    Storage #1Samsung 850 Evo 1000GB SSD M.2. 2280
    Storage #2Seagate 2TB 2.5inch 5400rpm and Seagate 2TB 2.5inch 5400rpm2.5 inch
    CPU CoolerBuilt-in
    CaseFrom factory
    Power Supply65W
    Keyboard Built in keyboard
    Mouse Built in mouse
    Headset Purchased Philips HeadSet
    Mouse Pad nil
    Headset/Speakers Realtek Builtin Speakers
    OS Windows 11 Enterprise 64bit v21H2 build no 22000.318
    Network RouterNextVision ONU Fiber Modem
    Accessory #1 Del Wired usb Mouse
    Accessory #2 Laptop Cooling table with fan
    Accessory #3 Secureye Usb finger print scanner added seperately for Windows Hello
    raju2529's Avatar
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    Feb 2018
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    @dardares
    will you contacted support team from EVGA and Sapphire website .I think , there are few troubleshooting steps might be included in those official website .
    If possible , send the details with videos to gpu developer email id.

  3. #3
    ROG Junior Member Array
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    Hi,

    Since i have the issues whit every gpu i put on the 2nd slot, i don't think is gpu related. Also, every single of gpu tryied on the 2nd slot working pretty good on the first slot, or on any other motherboard (first or the 2nd slot). I've tryied 4 different gpu.

    Thank

  4. #4
    ROG Guru: Green Belt Array
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    Probably not the GPU. Id guess limitation on lanes or incorrect BIOS setting.

  5. #5
    Administrator Array Silent Scone@ROG's Avatar
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    Mar 2016
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    Hello,

    Remove the CPU, check for any bent pins. Remount cooling whilst checking for even mounting pressure. You may wish to try outside of the chassis, too.

  6. #6
    ROG Junior Member Array
    Join Date
    Jul 2015
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    Hi,

    Just dismounted the board from the case, removing the cpu, make sure that no any pent are bent or damaged on the socket, make sure there is no dust or anything, it is not, plug a test powersupply on the bench whit the board on the table, still no any gpu detected on the pci x8_2. Still having power on it (gpu fan spin, but not recognized by the bios and the os)

    Thank

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