DVI-D Dual Link and 120hz not working?

[jakesamuelkelley]

I have two issues at the moment.

OS- Windows 8.1
Monitor- BenQ XL2420T
GPU- Asus GTX780 Directcu II OC

First, the monitor is supposed to be able to support 1980x1020 at 120hz, but I can only get it to 60hz. I've tried going through the NVIDIA controller and the Windows controller, and nothing. I tried creating a custom resolution at 120hz, and the screen went black. Does anybody know how to get it to 120hz?

Second, the DVI-D Dual Link isn't working. My computer is detecting that it's plugged in, but no signal is being transmitted. Currently, I'm using an HDMI cable, but the 3D on this monitor only works with the DVI-D Dual Link. I've tried two brand new cables from two different companies, so I'm sure that isn't the issue. It's in the right ports at both ends. Like I said, my computer detects that it's plugged in, but won't transmit any signal. If I don't use the HDMI, all I get is a blue screen saying no signal detected, even when I reboot without the HDMI and just the DVI. Does anybody know how to get the DVI-D working?

 

[Vitric9]

Is there a switch on the Graphics card to enable Dual Link DVI-D?

 

[jakesamuelkelley]

I've looked all over the card, nothing. I looked online and there isn't a switch. It's a native DVI-D Dual Link port.

 

[Vitric9]

Also the Monitor might need a driver or some software

 

[Vitric9]

I've looked all over the card, nothing. I looked online and there isn't a switch. It's a native DVI-D Dual Link port.

And I don't mean to pester but your absolutely sure you plugged in the Dual Link DVI cord and not a DVI cord that was close by maybe? They are two different cables as one has more pins....here is a pic http://superuser.com/questions/362878/dvi-i-single-link-vs-dual-link I am just being thorough so do not take offence. Some monitors only have a single DVI- in. I know the one your talking about has Dual link DVI in but you can still use a single DVI out on it.

 

[jakesamuelkelley]

I've already tried through the CD that came with the monitor, through the website, and through Windows Device Manager. Drivers are up to date, and if additional software is needed, it's not listed or posted anywhere.

 

[Vitric9]

I have mine plugged into DVI-I and I am running 144hz with a Nvdia card.... try the DVI-I

 

[jakesamuelkelley]

Well I just tried the cable on a different monitor and it worked fine, so I'm guessing it's either a problem with the port or something else to do with the monitor. Still no solution to the 120Hz problem yet, either.

 

[Cons29]

make sure you have the correct cable, i have a 120hz, and my old cable cant do 120, i use the one that came with the monitor