Displayport 1440p problem

[TheKusari]

So, I have a ASUS GTX 980 STRIX in my PC, and have three ASUS VX24AH 1440p monitors hooked up.

One via gpu HDMI to monitor HDMI

One via gpu DVI to monitor HDMI

One via gpu Displayport to monitor HDMI

 

The monitors connected via HDMI and DVI can be set up to display a 1440p image natively, however the third monitor (connected via Displayport) is maxed out at 1080p within my system and NVIDIA control panels.

Through research I've seen multiple times over that Displayport can run at 1440p no problem, but it's bugging me that 2/3 are 1440p and 1/3 is 1080p. I'd like it all to be the same.

 

Any reasons as to why this is happening? Bottleneck? Some setting I've missed?

 

GOAL: To have all three monitors running at 1440p @ 60fps. 

 

I've resulted in applying a custom resolution of 1440p to the displayport monitor temporarily while I try get it sorted out.

[Glenwing]

6 hours ago, TheKusari said:

So, I have a ASUS GTX 980 STRIX in my PC, and have three ASUS VX24AH 1440p monitors hooked up.

One via gpu HDMI to monitor HDMI

One via gpu DVI to monitor HDMI

One via gpu Displayport to monitor HDMI

 

The monitors connected via HDMI and DVI can be set up to display a 1440p image natively, however the third monitor (connected via Displayport) is maxed out at 1080p within my system and NVIDIA control panels.

Through research I've seen multiple times over that Displayport can run at 1440p no problem, but it's bugging me that 2/3 are 1440p and 1/3 is 1080p. I'd like it all to be the same.

 

Any reasons as to why this is happening? Bottleneck? Some setting I've missed?

 

GOAL: To have all three monitors running at 1440p @ 60fps. 

 

I've resulted in applying a custom resolution of 1440p to the displayport monitor temporarily while I try get it sorted out.

Try setting a custon resolution in the NVIDIA control panel.

[TheKusari]

3 hours ago, Glenwing said:

Try setting a custon resolution in the NVIDIA control panel.

I said in my post that I set a custom resolution on my third monitor to 1440p temporarily (till I can find out how to fix my problem)

[Glenwing]

3 hours ago, TheKusari said:

I said in my post that I set a custom resolution on my third monitor to 1440p temporarily (till I can find out how to fix my problem)

Sorry, I didn't see that last line. The problem really is that HDMI is designed for home theaters, and especially earlier versions did not have proper support for resolutions above 1080p, even though higher resolutions were within their capability, so custom resolutions / EDID overrides were sometimes required to get 1440p 60 Hz working properly. The DisplayPort controller uses its own built-in HDMI capabilities when an adapter is used, and it is an older version than what's on the card (which is why HDMI 2.0 is not supported through a DisplayPort adapter). So, as with other older HDMI devices, it sounds like a custom resolution is needed to set it at 1440p. But it sounds like you've already taken care of that  

[TheKusari]

On 8/9/2016 at 1:17 PM, Glenwing said:

Sorry, I didn't see that last line. The problem really is that HDMI is designed for home theaters, and especially earlier versions did not have proper support for resolutions above 1080p, even though higher resolutions were within their capability, so custom resolutions / EDID overrides were sometimes required to get 1440p 60 Hz working properly. The DisplayPort controller uses its own built-in HDMI capabilities when an adapter is used, and it is an older version than what's on the card (which is why HDMI 2.0 is not supported through a DisplayPort adapter). So, as with other older HDMI devices, it sounds like a custom resolution is needed to set it at 1440p. But it sounds like you've already taken care of that  

 

Further reading into the matter has also revealed that a single GTX 980 cannot drive three 1440p monitors to begin with.

So it might not be my cables at all, it could be that my GPU is underpowered for what I wish to succeed at doing.