I had to turn MTS off on my monitor for it to go from 30 hz to 60 hz .... delve into the OSD and changed the relevant option in the setup menu
1.1DP doesn't support 60hz if I recall.
MTS, do you mean 'Multi Track Sound'?
i have the same Monitor.
I just get a Sapphire Nitro 470 and got the same problems.
Without any driver i am at 64 Hz at Ultra HD (3840*2160)
After installing 16.9.2 (or 16.9.3 beta) i only have 30 Hz at that resolution.
It is not a matter of the cable (high quality DP cable). I had a Geforce 980 Ti before and there were no problems. Even with the Intel CPU graphics i had 60 Hz at ultra hd.
What can i do? (MTS is no option in the monitors menu)