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Z270 FTW K - PCIe1 not running x16 or x8

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smchan
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Tuesday, March 23, 2021 3:55 PM (permalink)
I have a z270 FTW K with BIOS 1.08.   I installed a 3xxx series GPU in the machine recently, and PE2x16 will not run at x8 or x16 speeds.   I see x4 in the BIOS, and GPU_Z says "card reports that it supports: PCI-Express x16 4.0. It is currently running at PCI-Express x4 3.0."   When I move the card to PE4x8, the card will run at x8.    I have an NVMe drive in Socket 3(2) but that ought not affect PE2's performance.    The GPU is snug into PE2 and I don't see any debris or bent pins.  

Any clue how I might get PE2 running at x8 or x16 speeds?
 
Thanks!
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    HeavyHemi
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    Re: Z270 FTW K - PCIe1 not running x16 or x8 Tuesday, March 23, 2021 9:16 PM (permalink)
    smchan
    I have a z270 FTW K with BIOS 1.08.   I installed a 3xxx series GPU in the machine recently, and PE2x16 will not run at x8 or x16 speeds.   I see x4 in the BIOS, and GPU_Z says "card reports that it supports: PCI-Express x16 4.0. It is currently running at PCI-Express x4 3.0."   When I move the card to PE4x8, the card will run at x8.    I have an NVMe drive in Socket 3(2) but that ought not affect PE2's performance.    The GPU is snug into PE2 and I don't see any debris or bent pins.  

    Any clue how I might get PE2 running at x8 or x16 speeds?
     
    Thanks!


    Does the GPU operate at x16 in another system? If so, then the most likely culprits are the PCIe slot or a problem with the CPU seating in the socket.

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    MhzManiac
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    Re: Z270 FTW K - PCIe1 not running x16 or x8 Wednesday, March 24, 2021 2:38 AM (permalink)
    If your m2 socket is populated it can take away 4 PCIE lanes. All lanes come from the cpu, Skylake and Kaby Lake-S Socket 1151 processors have 16 PCI-E lanes available for routing. 
    Also from the manual:Conflict: Key-E shares one PCI-E lane with PCI-E slot 3 (PE3). As a result, these devices are mutually exclusive and must be enabled/disabled in the BIOS.
    lanes are 3x PCI-E x16 slot 1x16/8, 1x8, 1x1.
     
    It's possible the lanes are being shared or the cpu does not support it.
     

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