I have an ASUS mining edition rx 470, which only has a DVI dual link connector. When i connect it to my LG 24MK400-H 75hz monitor i only get 60 hz, and when i try to set 75hz the radeon settings give me an error saying that these settings are not compatible with the display, and i think that's because i use a dvi to hmdi cable , beacuse my monitor only has hdmi and vga. When i connect my laptop, or my GT 1030 i ran the monitor at 75hz without any problem with an hdmi cable. How can i use 75hz? Dvi dual link supports 1920x1080 up to 144hz so it should work.
(Sorry for bad English)