RX480 & 5K

Discussion in 'Mac Pro' started by javinv, Aug 20, 2016.

  1. javinv macrumors newbie

    Joined:
    Nov 29, 2014
    #1
    Hi there,

    Thanks to @theitsage's guide on how to modify AMDRadeonX4000.kext, my new RX480 has Metal support and works perfectly on MacOS Sierra latest beta.

    I have a Dell 2715K display but it is being recognized as two different displays, one that is what I see in my (real) display at 2K resolution and another one that I cannot see, but that MacOS shows in the alignment displays preference panel as is it was there as a secondary display.

    To activate 5K on Nvidia cards, it is necessary to first activate that mode with:

    nv_spanmodepolicy=1 nvda_drv=1

    I was wondering if something similar would activate it for AMD graphic cards ?

    Any idea would be much appreciated !
     
  2. enforcerz macrumors newbie

    Joined:
    Apr 9, 2015
    #2
    I also really want to know.
    I plan to buy the new RX480. If RX480 can use with 5K monitor instated of GTX970.
     
  3. Halbertus macrumors newbie

    Halbertus

    Joined:
    May 6, 2015
    #3
    Any updates on this? Will Radeon drivers be compatible with that 5K Dell dual cable monitor?
     
  4. Fl0r!an macrumors 6502a

    Joined:
    Aug 14, 2007
    #4
    Some weeks ago I've helped a Hackintosh user @ tonymacx86 to do some experiments with a 5K hooked up to his R9 280X. We got 5K working (it's the first success on an AMD GPU I know of) with some glitches (don't remember, have a look at his posts for details).

    It involved fiddeling with framebuffer personalities and and different SMBIOS profiles, both of which isn't much fun on a genuine Mac.
     
  5. Fl0r!an macrumors 6502a

    Joined:
    Aug 14, 2007
    #5
  6. Halbertus macrumors newbie

    Halbertus

    Joined:
    May 6, 2015
    #6
    Thanks for sharing that information!
    Unfortunately I decided to return my RX480 just yesterday because it would not output 5K by any tweak I used.
    (This is running eGPU via Thunderbolt2) - I replaced it with a GTX980, which works okay in full 5120x2880 - although I am suffering from cursor glitches, that have been reported numerous times and start to get annoying

    I would really appreciate if someone running Dell 5K and RX480 could verify and report in more detail!
     

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