RX 480 in 5.1 Mac Pro through bootcamp?

Discussion in 'Mac Pro' started by Beno201, Aug 11, 2016.

  1. Beno201, Aug 11, 2016
    Last edited: Aug 11, 2016

    Beno201 macrumors member

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    Aug 10, 2016
    #1
    has anyone done this? Does it work in OSX? How about bootcamp?
    Can't find much information on it.

    Thanks a bunch

    EDIT: Found out it will not work with OSX. Will it work with bootcamp on a Mac Pro?
     
  2. Beno201 thread starter macrumors member

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    Aug 10, 2016
    #2

    Anybody know?
     
  3. theitsage macrumors 6502a

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    Aug 28, 2005
    #3
    RX 480 works in MacOS 10.12 beta. I have not been able to boot Windows 10 successfully with it in my 5,1.
     
  4. Beno201 thread starter macrumors member

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    #4
    That's interesting, any idea as to why it won't work?

     
  5. theitsage macrumors 6502a

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    #5
    I have no clue. I installed Windows 10 with both the original 5770 and RX 480 connected. However, Windows didn't recognize the RX 480 at all. The Crimson drivers could not be installed because it did not find a compatible card.
     
  6. Beno201 thread starter macrumors member

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    #6
    Hmm, how odd.

    Would it be possible to launch straight into Windows 10 bootcamp or OSX using the 480, without the 5770 in there?
    Or does the original card have to be in there?
     
  7. theitsage macrumors 6502a

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    #7
    Single RX 480 and dual RX 480 works great in MacOS beta - no need for 5770. I used the 5770 in order to select the boot option during Windows 10 installation.
     
  8. Beno201 thread starter macrumors member

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    #8
    Ah okay, I see.
    So you can't boot into Windows 10 without having the 5770 in there? Is that right?
     
  9. theitsage macrumors 6502a

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    #9
    Tried it again today and I was able to get 2 x RX 480s running CrossFire in Windows 10.

    I had to pair a GTX 980 Ti with the 5770 first, then GTX 980 Ti with RX 480, and eventually a pair of RX 480s.
     
  10. William_si macrumors regular

    William_si

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    #10
    Works fine in my Windows 7 as well, in slot 4 (x4, overlapping into the HDD bays 2,3,4). R9 270X in slot 1 as primary, R9 280X external on x1 for boot selection/bitlocker.

    Windows 10 does not install via bootcamp (black screen) and i did not think of it as RX480 related but might be the case; need to test.

    As expected with a second card on the internal PSU (in my case the R9 270X on the 2 6pin and the RX480 on DVD bay power) the Mac turns off if both run at 100% load (rail draw 180+170W/350W or 29A @ 12V) - a lower level load actually works due to the rather low TDP of both (270X+290X nearly immediately turns off a Mac Pro in load tests).
     
  11. Beno201 thread starter macrumors member

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    Aug 10, 2016
    #11
    So the card works providing there's not too much power being pulled from the PSU (ie multiple GPU setups in SLI or crossfire)?
     
  12. William_si macrumors regular

    William_si

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    #12
    Seems so, and provided you have a flashed/original GPU for boot selection.
     
  13. Beno201 thread starter macrumors member

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    Aug 10, 2016
    #13
    Cool.
    Where do I learn how to flags the original GPU (forgive my naivety - quite new to this)

    Thanks
     
  14. William_si macrumors regular

    William_si

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    #14
    Edit: gah wrong thread. Not Nvidia.

    You can't flash an RX480 (at least now). You need a second, supported, card for the selection and encryption (if any).
     
  15. SolidCake macrumors member

    SolidCake

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    May 20, 2016
    #15
    They just work? No need for a UEFI GPU card to run the screen? Do you also get the full boot sequence just the RX 480?
     
  16. theitsage macrumors 6502a

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    #16
    No boot screen but they work in MacOS Beta and Windows 10. I use BootChamp to switch to Windows.
     
  17. SolidCake macrumors member

    SolidCake

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    #17
    Thanks! I'm thinking about buying the 8GB version of this card and then use the standard Apple GPU to drive the screen.
     
  18. theitsage macrumors 6502a

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    #18
    One odd behavior I noticed was that I could not boot into MacOS when I have both 5770 & RX 480 plugged in. Windows 10 would boot but only recognized the 5770.
     
  19. SolidCake, Aug 16, 2016
    Last edited: Aug 16, 2016

    SolidCake macrumors member

    SolidCake

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    #19
    Thanks!
    Which of those cards goes to the screen? I've heard that if you use the 5770 to drive the screen you get the full boot sequence and you can use the RX 480 to do the graphic computing. Is there any chance that AMD might come out with a MacOs drive for the RX 480?
     
  20. theitsage macrumors 6502a

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    #20
    The 5770 is what came with my Mac Pro so it's the one showing boot screen. I've been able to successfully boot with a single and dual RX 480 into both MacOS and Windows 10. Same result when pairing 5770 with GTX 980 Ti.

    What I'm amazed by is that I could not boot into MacOS when pairing 5770 with another AMD GPU; I tried RX 480 and flashed R9 280x).
     
  21. Beno201, Aug 16, 2016
    Last edited: Aug 16, 2016

    Beno201 thread starter macrumors member

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    #21
    Why do you need the standard Apple card to drive the screen if the 480 works fine by itself?
    Is a boot screen required or can boot into OS X or Windows without it?
     
  22. javinv, Aug 20, 2016
    Last edited: Aug 20, 2016

    javinv macrumors newbie

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    #22
    I did the same and my RX480 was not recognized as well. The AMD/ATI drivers wouldn't install since they didn't find any compatible AMD graphic card.

    However, the RX480 was listed as a Microsoft Compatible Graphic Card (or something similar) in the device manager. I updated its driver to the one included in the AMD drivers (in the Crimson Drivers\Packages\Drivers\Display folder) and it worked ! Then it restarted and both graphic cards started working correctly.

    I haven't been able to make both graphic cards work together in MacOS Sierra. If the 5770 is present, the 480 won't get Metal support (after modifying the radeon4000.kext file), but it works if I disconnect the 5770. Any idea on what could be the problem?

    I haven't been able to get 5K resolution in macos... my Dell 2715K is detected as two separated displays... any advise??
     
  23. theitsage macrumors 6502a

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    #23
    I'm glad you were able to manually install the drivers for RX 480 in Windows. I tried that too but Windows crashed.

    MacOS is a different story when you have the 5770 paired with RX 480. You've gotten much further than I did. My Mac Pro could not even boot up to the desktop with these 2 GPUs together.

    This is after all a hack to get RX 480 to work in MacOS. I hope the GM version will have newer and better drivers.
     
  24. javinv macrumors newbie

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    Nov 29, 2014
    #24
    Thank you so much for sharing the kext trick !

    Did you tried to install the drivers of the path that I posted?

    Maybe the difference in our setups is the slots in which the graphic cards are inserted. I guess mine at that time was the 5770 in the first one (the one meant for the graphic card) and the RX480 was at the 4th (the last one in which if fits before the hard drive slots).
     
  25. theitsage macrumors 6502a

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    #25
    I forgot where I pointed Windows Installer to - must be a wrong directory and that crashed it. You may be right about the slots in which I installed these GPUs. It's good to hear there's a way to make it boot just in case I need the boot screen.
     

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