Driving 3 monitors at 144Hz, how to connect the 3rd?

marrs · Jan 5, 2014

I recently bought a system with a GigaByte graphics card with GeForce GTX 780 [1] and three BenQ XL2411T monitors that do 1920x1080 at 144Hz.

The graphics card has 4 outputs: 2xDVI, 1xHMDI and 1xDP.

The two monitors that are connected via DVI can both be run at 144Hz.
The third monitor that is now connected via HDMI can only be run at 60Hz.

I am using this system with a triple screen setup (for racing simulations) and as soon as I make a “combined” screen with the nvidia software, that whole screen becomes 60Hz. Not a surprise, since it has to adapt to the slowest of the three screens.

I know I probably need to connect the third monitor using a DP->DVI adapter to go to 144Hz, but I’m not sure what adapter to get. I don’t care about 3D modes, 2D is just fine, but I would like to have that at 144Hz. Is that possible, and if so, what adapter do I need (an active or passive one, and which specific model)?

bryonhowley · Jan 5, 2014

Well the main problem you are going to have even connecting to the DisplayPort is being able to hand a frame rate that high with just a single GTX 780 running at 5760x1080 that is a lot of pixals to push with that resolution and such high frame rate. I think you are going to find you are going to have to go SLI to get that. At 60hz you might make it but even then I am not sure with a single card.

marrs · Jan 5, 2014

You mean the card cannot push that many pixels to the monitors?

Because the racing simulations I'm playing are easily doing 200fps at the moment (with the screens now running at 60Hz). So unless you are telling me I'm hitting a hardware barrier in my GTX 780 card my question still stands.

chris987 · Jan 5, 2014

display port cables support 120 or above. hdmi supports 120hz from 1.4b version i think. 144hz im not sure though
better take dp cable

marrs · Jan 5, 2014

The BenQ monitors I have don't have a DP, which is why I'm looking for advice on a DP->DVI adapter.

chris987 · Jan 6, 2014

dp to dvi adapter will work. the adaper must be dual link capable to output 144hz though(it must have all the pins dual lind dvi-d connector has)

marrs · Jan 14, 2014

I ended up getting the following adapter:
Accell B087B-007B (mini) DP naar DVI-D Dual-Link Adapter [1].
That one works nicely at 144 Hz. I did end up having "snow" in the picture when switching from 60->144 Hz but if everything is at 144 Hz it works (the snow disappears after a reboot).

[1] http://www.kabeltje.com/displayport-of-mini-displayport-naar-dvi-d-dual-link-adapter-met-3d-ondersteuning

chris987 · Jan 14, 2014

I have 2420t and I get horizontal lines beraly visible when enabling instant mode on through the monitors settings I think yours has it too try disabling it to get rid of the snow thing you say. You have 144hz...but how? I thought 2420T including yours support only 120hz

marrs · Jan 20, 2014

I've read that more people seeing very faint horizontal lines. I personally don't see them. The xl2411t does 144Hz as advertised on the box, but I must admit that I have since moved back to 120Hz which enabled me to run "Lightboost" in 2D. That gets rid of all the ghosting, which is a huge improvement on an already great picture (and a completely different topic, probably worth a different thread, but I mainly used information found here to achieve it: http://www.blurbusters.com/

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