Rx 560 in Mac Pro 3.1

[Jerky]

Hi,
my original Apple AMD gfx card has gone. So I read all hints and infos about replacing gfx cards in Mac Pro 3.1 all over the www
I choose a cheap Sapphire RX 560 Pulse, because several users reports a go for this card.
But it doesn’t work in my 3.1. I only get a white screen on boot.
Placing the card in an borrowed 4.1 Mac Pro, the card works right out the box.
Than I tested a Nvidia GTX 960 from the 4.1 Mac Pro in my 3.1, and the Nvidia woks fine.
Replacing the Nvidia with the new RX 560 I only get a white screen.
Any suggestions?

Mac Pro 3.1: dosdude1 patched 10.13.2
Mac Pro 4.1: macOS Sierra 10.12.6

 

[bsbeamer]

You might need to update (flash) the 3,1 > 4,1 (or 5,1) identifier and install the latest macOS for support. There may be kext(s) that need to be edited or added as well for the GPU.

See this thread for AMD GPU:
https://forums.macrumors.com/threads/amd-polaris-gpus-plug-and-play-in-macos-10-12-6-10-13.2050945/

I'm on a genuine 5,1 and use NVIDIA GTX 1080 at the moment. No problems when using NVIDIA web drivers.

 

[jmp473]

The Devil is in the Details.

While I use a Sapphire RX 460 in my 3,1 daily w/ Sierra - it's not an absolutely perfect solution.

If others have recommended an RX 560 in a 3,1 you better take the issue up with them. IMHO the performance would likely be too bottlenecked in the 3,1 in any case.

 

[Jerky]

Thanks for your remarks.
Yes, it must be one of those small differences.
At weekend I setup the 3.1 Mac Pro with a fresh 10.12.6 (similar to the working 4.1 Pro)
Remainig differences: sierra patched and hardware.
But no, 2 hours lost for nothing.
OK, the Mac Pro was cleaned

 

[t8er8]

Thanks for your remarks.
Yes, it must be one of those small differences.
At weekend I setup the 3.1 Mac Pro with a fresh 10.12.6 (similar to the working 4.1 Pro)
Remainig differences: sierra patched and hardware.
But no, 2 hours lost for nothing.
OK, the Mac Pro was cleaned

Did you ever get this working in your Mac Pro?

 

[BrayanMacPro3.1]

Try to uninstall and reinstall the OS. I had this problem with 5770, but after reinstall it was working normally.