Ultrawide monitor resolution 3840x1600@60hz

[iDVD]

Hello, I have problems with LG 38UC99 monitor and ATi HD 5870 in macOS. I have @30Hz at the full resolution. Monitor is connected via DisplayPort. I'm using clover and macOS Sierra. Btw in the Win10 monitor works fine.
Maybe someone have similar problems? Or someone can help me to solve the problem?

 

[iDVD]

Anyone?

 

[iDVD]

I connected this monitor to MacBookAir mid2013 via display port and its worked just fine(macOS 10.12.2)

Maybe is the way to hack something in clover or something?

 

[tallen]

http://www.amd.com/en-us/products/graphics/desktop/5000/5870

According to these specs, the card can't run beyond 2560x1600.

 

[iDVD]

http://www.amd.com/en-us/products/graphics/desktop/5000/5870

According to these specs, the card can't run beyond 2560x1600.

Yes, I know ant the card have DP 1.1. Somehow with this card can drive my monitor at 3840x1600@30Hz on the macOS and 3840x1600@60Hz on Windows. According to this user he got 4k@60Hz on MacPro with ATi 5870.

Screenshot from my system.

 

[tallen]

Yes, I know ant the card have DP 1.1. Somehow with this card can drive my monitor at 3840x1600@30Hz on the macOS and 3840x1600@60Hz on Windows. According to this user he got 4k@60Hz on MacPro with ATi 5870.

Screenshot from my system.

That's very impressive with such an old card, but I'll tell you, my 280x at UHD runs MacOS noticeably less smooth than at 1080p. So even if you can enable 60hz, I'd be curious what FPS you can hit when manipulating the UI.

 

[Fl0r!an]

4K@60hz is technically impossible through DP 1.1, that guy doesn't know what he's talking about.

4K@30hz should be fine though, as it doesn't need more bandwidth than 2560x1600@60Hz.