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hi, 

i recently bought an new samsung 4k monitor and i have gigabyte r9 390 g1 gaming video card, i tried to connected to monitor with HDMI  but apparently the GPU has no HDMI 2 output. Then I got ab brand new  display port 1.2 i connected the cable to my video card and there was no display(only black screen) after 2 minutes the monitor started a slip mode, what can i doo to get 4k in 60Hz. when i am booting the pc i have a signle threw the dp cable, an when the windows is starting the image is despairing, it sims as a driver problem =( i have tried all the amd drivers vr.), when I uninstalled the driver I got an image but only in 720p  

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https://linustechtips.com/topic/645336-samsung-u28d590d/
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