Nvidia 1080 works in one Mac Pro 5, 1 but not another

Discussion in 'Mac Pro' started by covalt, May 21, 2018.

  1. covalt macrumors newbie

    covalt

    Joined:
    Sep 24, 2010
    Location:
    Los Angeles, CA
    #1
    I am in a studio with several Mac Pro towers (5,1 models); we're upgrading all the GPUs to Nvidia 1080 cards because we're using Octane for 3D rendering.
    I've successfully gotten cards installed in 4 different Mac Pros (all 5,1 models, various CPUs).
    The cards are either Nvidia Founders Edition 1080 or EVGA GeForce GTX 1080.

    However, I cannot get cards to be recognized in 2 remaining Mac Pros.
    To be sure that I didn't have some software gremlin standing in the way (after many failed attempts at getting it to show up), I completely erased the OS hard drive and installed a fresh copy of 10.3.4.
    I then ran the security update, so the macs are all running 10.13.4 (17E202), with the Nvidia Web Driver 387.10.10.30.107 and CUDA driver 396.64.
    Even still, when I drop the Nvidia card in the PCI slot and start up, I never get a screen. I use Remote Desktop to login and see that no graphics card is recognized.

    I've even swapped the hard drives between a Mac Pro that DOES work with an Nvidia card with one that's NOT working, and the problem remains - that Mac Pro will still not show a picture or recognize that an Nvidia card is installed in the PCI slot.

    Anyone have any ideas what I might be missing, or what could have gone wrong in 2 of these machines?
    I'm totally stumped and have not been able to figure out a solution.
    Thanks!
     
  2. Darmok N Jalad macrumors 65816

    Darmok N Jalad

    Joined:
    Sep 26, 2017
    Location:
    Tanagra
    #2
    It's possible the power supply connectors aren't working well anymore on the ones that are not booting. Are you trying to power the cards with the mini-PCIe connectors from the motherboard, or through adapters off the optical drive bays?
     
  3. covalt thread starter macrumors newbie

    covalt

    Joined:
    Sep 24, 2010
    Location:
    Los Angeles, CA
    #3
    I've wondered the same thing but wouldn't know how to test that. I'm using the mini-PCIe connectors on the motherboard.

    Here's the thing.. through MANY times of trial and error and just about going crazy, I've gotten them to work. I reset PRAM, SMC, unplugged and replugged about 20 times each Mac Pro. Eventually, they showed a display with the Nvidia card installed. I don't know if it's just random or what. I didn't have any trouble with 4 other Mac Pros, and didn't have to do PRAM or erase the entire OS drives.. but for whatever reason these two machines were just difficult!
     
  4. Darmok N Jalad macrumors 65816

    Darmok N Jalad

    Joined:
    Sep 26, 2017
    Location:
    Tanagra
    #4
    You are dealing with dropping in new and demanding cards in rather old hardware. It’s amazing how responsive the old cheese grater MPs still are after all these years.
     

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