Weird situation, M18X R2 + 4GB GTX 980m = PCIe Bus speed stuck @ 4x 3.0

Discussion in 'Alienware 18 and M18x' started by UltraGSM, Jun 5, 2020.

  1. UltraGSM

    UltraGSM ...so many Alienwares...

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    as title says...
    PCIe Bus speed stuck @ 4x 3.0

    Ive tried this card in 3 different M18Xr2 so far, all show the same results.

    OS: w7 x64
    SYS BIOS: A11 ModUnlocked to support maxwell gpus
    BIOS BOOT: Legacy
    GPU Switch mode: SG ( Does not boot in PEG = 8 beeps )
    GPU: MSI Brand GTX980m 4GB
    Idle temps good, benchmark on unigine heaven seemed bit poor compared to 680m sli, although load on gpu as reported by HWINFO seems correct and appropriate, see screenshots
     

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  2. ssj92

    ssj92 Neutron Star

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    HWInfo shows PCIe link speed maximum at 8 GT/s?

    Try clicking the ? in GPU-Z, run the load test and see what result you get in GPU-Z.
     
  3. UltraGSM

    UltraGSM ...so many Alienwares...

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    PCI-Express x16 3.0 @ x4 3.0

    I noticed my vbios shows as DELL, although its Msi card. maybe vbios is doing something to the extent?

    otherwise, what do you think of unigine score ?
     
    Last edited: Jun 5, 2020
  4. UltraGSM

    UltraGSM ...so many Alienwares...

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    look at those detailed infos from hwinfo, maybe they reveal something ?

    [​IMG] [​IMG] [​IMG]
     

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  5. ssj92

    ssj92 Neutron Star

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    It will show up as Dell because your computer is Dell. vBIOS won't change what it's identified as.

    Maybe @Raidriar knows more

    Can't believe I am doing this on my work computer LOL. Run the GPU-Z render test with GPU-Z open...kinda like this, except I don't have a GPU on my work computer.

    [​IMG]
     
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  6. UltraGSM

    UltraGSM ...so many Alienwares...

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    is that ok?
    + NVinspector screenshot[​IMG]
    [​IMG]
     

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    Last edited: Jun 5, 2020
  7. ssj92

    ssj92 Neutron Star

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    Yup, it's definitely running at x4 speeds.

    There's an option in the BIOS you can try, I forgot what it was, it has to do with PCIe link speed I think. I need to go to my M18x later and see what it was.

    Don't remember if this was an optimus issue.
     
  8. UltraGSM

    UltraGSM ...so many Alienwares...

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    Ive seen pcie link speed options in bios settings too but I'm not that familiar with these settings all that much. Ive went through the list and only thing I wasn't worried about changing was pcie gen speed , all links were set on auto but one was set to gen1, so out of 3 options: gen1/gen2/auto, I picked auto... Made no difference so far.

    Regarding optimus thing, can I convert this card in some way bios mod/hardware mod etc? So it will allow booting from PEG video settings instead of SG?
     
  9. UltraGSM

    UltraGSM ...so many Alienwares...

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    On a side note, disabling iGPU and running only on PEG, is it even an option/a possibility on m18xr2 when running legacy boot & win7? Pardon me, Ive just not dove deep enough in this investigation due to time constrains, but would love to hear those who went trough this/succeeded or failed, to share with me about this...? I have just googled a bit , found somewhere that in a case of m17xr temperatures are not being read correctly while in m17xr4 on SG and performance suffered too, until user managed to switch to PEG only but he had to go with UEFI boot / iGFX manually disabled and PEG set to always enabled... am I on to something?
     
  10. ssj92

    ssj92 Neutron Star

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    You cannot run PEG because your 4GB 980M is a g-sync model I believe.

    Only the 8GB 980M non g-sync cards can run in PEG.
     
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