Hello, Sorry for the layout, It is my first post and cannot figure out why I'm unable to use new lines. Thanks a lot, I'm getting new PC gear ready for playing DCS again and are using your information for wat to buy. Are you using the DisplayPort for 4K resolution? Specs of Gigabyte GV-R939G1 GAMING-8GD mentions 4K@60Hz on the DisplayPort. Dual Link DVI: 2560 x 1600 @60Hz DisplayPort: 4096 x 2160 @60Hz HDMI: 4096 x 2160 @24Hz, 3840×2160 @30 Hz Specs of Gigabyte GV-N970IXOC-4GD are: Dual Link DVI: 2560 x 1600 @60Hz DisplayPort: 4096 x 2160 @60Hz HDMI: 3840 x 2160 @60Hz / 4096 x 2160 @24Hz Can you mention which graphic card you are using for the test?