<< Solved >> 4k video with RX 570 8GB

[wirretheman]

Hi, how do I get 4k resolution with a RX 570 8GB on Big Sur? I can only chose 1600*900, 1080p or 720p.

I have tried to update OC and kexts to the latest versions.

CPU = i7-8700.
Motherboard = Gigabyte.
I use a DP cable.

I had 4k when I first hooked up my new monitor (LS32A70). But after a reboot I only had 1080p.

Any help would be appreciated!

 

[pastrychef]

Hi, how do I get 4k resolution with a RX 570 8GB on Big Sur? I can only chose 1600*900, 1080p or 720p.

I have tried to update OC and kexts to the latest versions.

CPU = i7-8700.
Motherboard = Gigabyte.
I use a DP cable.

I had 4k when I first hooked up my new monitor (LS32A70). But after a reboot I only had 1080p.

Any help would be appreciated!

You shouldn't need to do anything extra. Even on my RX 560, 4K is available as an option by default.

 

[wirretheman]

Sorry for the headline, it's a 570 not 580.

Could it be the system identifier? I use Mac Pro (2019).

 

[craighazan]

Sorry for the headline, it's a 570 not 580.

Could it be the system identifier? I use Mac Pro (2019).

Try iMac19,1, see if that helps.

 

[pastrychef]

Sorry for the headline, it's a 570 not 580.

Could it be the system identifier? I use Mac Pro (2019).

It shouldn't make a difference... Please post your EFI.

 

[wirretheman]

It works when I changed the SMBIOS to iMac19,1. SOLVED!