RX480 & 5K

javinv

macrumors member
Original poster
Nov 29, 2014
41
39
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 !
 

enforcerz

macrumors newbie
Apr 9, 2015
10
2
I also really want to know.
I plan to buy the new RX480. If RX480 can use with 5K monitor instated of GTX970.
 

Halbertus

macrumors newbie
May 6, 2015
21
0
Any updates on this? Will Radeon drivers be compatible with that 5K Dell dual cable monitor?
 

Fl0r!an

macrumors 6502a
Aug 14, 2007
906
527
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.
 
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Halbertus

macrumors newbie
May 6, 2015
21
0
Short update on this:

Some fellow @tmx86 has recently figuered out an easy way to enable 5K with Radeon GPUs, should work with the RX 480 as well. Seems to require just a small AGDP patch, details are here: https://www.tonymacx86.com/threads/...d-graphics-cards.171291/page-100#post-1462727
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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