triple 2560x1440 on gtx 970

[MrHiddeS]

As the title says, I have three 2560x1440 monitors, three u2515H to be exact.

I have them daisy chained through the displayports from the gpu to one another.
Now, today my third monitor arrived and everything is fine but the one thing that isnt working is that the third monitor doesnt seem to want to display in 2560x1440, when I try to change its resolution it is capped at 2048x1152.
But ofcourse I want all three to run in 2560x1440. I will not use it for gaming.
Does anyone have an idea what is causing this or how I can fix it?

thanks in advance

 

[wildfire707]

All you actually have do do is the math for DisplayPort.

The Dell monitors that you mentioned support DisplayPort 1.2 and have MST hubs with one output port and one internal port. Since the DisplayPort 1.2 MST standard supports up to 4 1080p displays, that is 4 x 1920 x 1080 = 8294400 pixels. Your three monitors need 3 x 2560 x 1440 = 11059200 pixels. That is more than DisplayPort 1.2 can deliver through a single port.

The only reason that you can get the resolution that you are quoting is because of the extra bandwidth that is supplied for error correction, differing resolutions, and bidirectional communication.

What you basically need is a video card that has multiple DisplayPort ports on it, which a few of the GTX 970s do - and all of the GTX 980s do. Or swap to an AMD model that does.

You could also try using the HDMI output on your card for one of the monitors, but mixing DisplayPort and HDMI connections can cause tearing issues in video games (if it works at all while gaming).

BTW: For anyone who really gets into the standards, I know the bandwidth is not strictly for pixels - I am just simplifying it

 

[kossmann]

How can you use MST (Daisy Chain) with three U2515H? According to the operating instructions, the monitor only supports 2 devices in MST mode.

I would like to add a third monitor to my two monitors (U2515H) and ask myself, how to connect the third one to my GTX 970.

 

[MrHiddeS]

How can you use MST (Daisy Chain) with three U2515H? According to the operating instructions, the monitor only supports 2 devices in MST mode.

I would like to add a third monitor to my two monitors (U2515H) and ask myself, how to connect the third one to my GTX 970.

You can use the HDMI port for the third one, like I did back then.

 

[Saga Lout]

How can you use MST (Daisy Chain) with three U2515H? According to the operating instructions, the monitor only supports 2 devices in MST mode.

I would like to add a third monitor to my two monitors (U2515H) and ask myself, how to connect the third one to my GTX 970.

Wake up and check the date, please. This thread started in October 2015!

I'm closing it now so please start a new one of your own.