Dual displays with different resolution and refresh rate

mof · 15 Nov 2017 at 21:40

I'd appreciate a bit of help regarding using two different displays with one GPU.
I've got a 980 ti connected to a 4k 60Hz tv via HDMI and a 1080p 144Hz monitor via displayport.

The problem is that when both displays are connected and turned on the 144Hz screen is limited to 60 Hz.
If I turn the tv off then the monitor goes back to 144Hz. What I want to know is: is the 980 ti capable of outputting the two displays at the same time at their native resolutions and refresh rates?

aatu · 15 Nov 2017 at 22:58

I think you'd get more knowledgeable answers at the GPU section. As in this case, it's indeed the GPU that's the point of interest.

Anyway, my own guess would be that indeed, mixing different resolution and refresh rate combos can bring extra grievances. And one thing to make sure: are you running them in cloned or extended mode? I would reckon that cloned mode would be even more hazardous.

There might also be some sort of limitation with the GPU connections. For example, it might be that the bandwidth is somehow down-graded whenever the HDMI and DP are used simultaneously. But like said, the GPU section guys would probably have more insight on this.

trawetSluaP · 15 Nov 2017 at 23:49

I a run similar set-up.

144Hz Monitor and a 60Hz TV. They both run at they're own refresh rates like they should. Are you manually changing their refresh rates in Nvidia control panel?

Rroff · 15 Nov 2017 at 23:52

Sounds like something is limiting available bandwidth.

mof · 16 Nov 2017 at 15:49

Thanks for the responses.

It turns out that all I had to do was choose the "PC" 1920x1080 resolution in the nvidia control panel and then the 144Hz option would become available. It was defaulting to the "Ultra HD, HD, SD" 1080p, 1920x1080 (native) and 60 Hz was the highest refresh rate available.

This is useful so I can have sound outputting from my GPU again and use the 144HZ monitor at the same time.

EDIT

Now I have another problem. The 144Hz display flickers and goes blank when they are extended but it stops when I make the 60Hz one my main display.