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Two monitors, one DisplayPort?

T

Tisca

Limp Gawd
Joined
Sep 4, 2010
Messages
244
I have two 290s in Crossfire, each have DVI, DVI, DP, HDMI. I'm running through the DVIs currently but I need longer cables so I thought I could go with DP cables. Monitors have DVI and DP inputs. (1200*1600 @60Hz)

If I use DP for one of the monitors, what for the second? I'm assuming you need to run both outputs from one of the cards like always?
I do have a DP-DVI adapter but that won't do me any good, might as well just get a longer DVI cable instead.
Could you run one output from HDMI with a converter? (sounds like a longer DVI would be cheaper)

Thoughts?
 
If need to get longer cables anyway, why not just stick with DVI?

It doesn't matter if one monitor is using DisplayPort and the other DVI.
 
Snowknight26 said:
If need to get longer cables anyway, why not just stick with DVI?
Click to expand...

That's one of the questions. For the resolution and refresh rate it doesn't matter. Guess I'm looking for an excuse to not buy old tech like DVI.

I'm also under the impression that DP-DP cables are slimmer and bend more easily. Is this the case? Wouldn't mind that.
 
If I recall, displayport cables are only good for a short distance. Either run one off DP and one off DVI or just do both off DVI.

Edit: http://www.displayport.org/faq/
Q: What is the maximum length of DisplayPort cable that supports a resolution of 2560×1600?
A: 2560 x 1600 (WQXGA resolution) is supported over all 2-meter “DP Certified” cables. Some cables, due to their design, may be capable of supporting 2560 x 1600 resolution over lengths longer than 2 meters.

Also you could turn crossfire off and run a DP from each card.

Edit2: wiki says:
3 meters for full bandwidth transmission over passive cable.
33 meters over active cable
 
Last edited:
Edit2: wiki says:
3 meters for full bandwidth transmission over passive cable.
33 meters over active cable
Click to expand...

So "full bandwidth" is 2560 x 1600 and the longer 3m< passive cables work for lesser resolutions?

Looks like I'm going with one 3m DP and my old 2m DVI. Should be enough since the case is closer to one of the monitors... and don't have much other choice portwise.
Thx for the help!
 
Displayport v 1.2 passive will drive around 21.6 Gbps if all 4 links are saturated.

That is a 4k monitor at 60fps

Or 2- 2560x1600 @ 60 Hz

You should be totally fine running 2 monitors on one passive DP
 
staticlag said:
Displayport v 1.2 passive will drive around 21.6 Gbps if all 4 links are saturated.

That is a 4k monitor at 60fps

Or 2- 2560x1600 @ 60 Hz

You should be totally fine running 2 monitors on one passive DP
Click to expand...



This. Im using 3 via my 1 displayport on my HD 7770. Only Issues I've run into are the deep sleep problems.

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