mac pro 5,1 rx 580 sapphire not booting

Discussion in 'Mac Pro' started by MacScout, May 9, 2018.

  1. MacScout macrumors newbie

    Joined:
    Nov 21, 2016
    #1
    Hey everyone,

    I have a Mac Pro 5,1...3.46ghz 12 Core, 64gb RAM....Latest version of High Sierra.
    Recently purchased and installed an RX 580 Sapphire GPU.

    Computer does not boot. (Except for Safe Mode, in which the computer does recognize the card)

    I installed my older GPU along side the new RX 580 to see what was happening and it looks like the computer is freezing about 3/4 of the way into the boot screen.

    Any advice?
     
  2. t8er8 macrumors regular

    t8er8

    Joined:
    Dec 4, 2017
    Location:
    Quebec, Canada
    #2
    Have you tried resetting nvram and smc? Doing that can always help.
     
  3. MacScout thread starter macrumors newbie

    Joined:
    Nov 21, 2016
    #3
    That was my first thought, but it doesn't seem to change the outcome.​
     
  4. t8er8 macrumors regular

    t8er8

    Joined:
    Dec 4, 2017
    Location:
    Quebec, Canada
    #4
    Are you sure that the 6 pin power is properly powering the gpu, if so, I’d recommend swapping drives and reinstalling 10.13.4 on it.
     
  5. Manzanito macrumors regular

    Manzanito

    Joined:
    Apr 9, 2010
    #5
    Did you try re-seating your ram sticks? I had something similar happening, with boot freezing halfway, and re-seating RAM solved the problem.

    Probably won’t work, but it’s worth a try.
     
  6. MacScout thread starter macrumors newbie

    Joined:
    Nov 21, 2016
    #6
    Double checked the power cables and all are secure.
    I have tried several hard drives each, with the latest version of High Sierra. Same results

    No luck with physically resetting the RAM either.
    --- Post Merged, May 9, 2018 ---
    Also, this GPU was pulled from the Mac/Sonnet Graphics Developer Kit.
     
  7. t8er8 macrumors regular

    t8er8

    Joined:
    Dec 4, 2017
    Location:
    Quebec, Canada
    #7
    If this was pulled from an E-GPU kit it might have some strange efi flashing on it or a lockdown mechanism on it making it only work through Thunderbolt and eGPUS. I wouldn’t be surprised if they did this knowing how desperate bitcoin miners are to get a good deal on GPUs, but really I’m not sure how to help you.
     
  8. Jayson A macrumors 68000

    Joined:
    Sep 16, 2014
    #8
    How do you have it connected to power? I just installed a Sapphire Pulse RX 580 8GB in my Mac Pro 5,1 and I used a dual female 6 pin to male 8 pin cable from EVGA and mine works perfectly in macOS and Windows 10.

    Could it be a faulty card?
     
  9. MacScout thread starter macrumors newbie

    Joined:
    Nov 21, 2016
    #9
    It is connected to the motherboard via dual mini 6 pin to 8pin.
    Is there a way to test the integrity of the card?
     
  10. expede macrumors regular

    expede

    Joined:
    Jan 15, 2018
    Location:
    Sweden
    #10
    Hi!

    Maybe you tried this, but did you strip the cMP down to its old configuration. Native GPU(ATi Radeon), Apple RAM and pull all other PCI stuff out?

    /Per
     
  11. MacScout thread starter macrumors newbie

    Joined:
    Nov 21, 2016
    #11
    Yes, the computer boots as normal without the RX 580.
     
  12. MacScout thread starter macrumors newbie

    Joined:
    Nov 21, 2016
    #12
    After booting in safe mode, I get this banding (see attached photo) on the screen.[​IMG][​IMG]
     
  13. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #13
    If this card never verified can work properly. May be it's broken.
     
  14. t8er8 macrumors regular

    t8er8

    Joined:
    Dec 4, 2017
    Location:
    Quebec, Canada
    #14
    Could be a defective card, have you tried switching ports and cables between HDMI, dvi, and DisplayPort?
     
  15. MacScout thread starter macrumors newbie

    Joined:
    Nov 21, 2016
    #15
    Yes; same result no matter the port.
     
  16. MacScout thread starter macrumors newbie

    Joined:
    Nov 21, 2016
    #16
    Looks like it was a defective card. I ordered a new card and it arrived today and works like a charm.
     
  17. t8er8 macrumors regular

    t8er8

    Joined:
    Dec 4, 2017
    Location:
    Quebec, Canada
    #17
    Good to hear
     

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