120HZ LCD with Crossfire setup Q?

[GetFunk01]

In my duel LCD setup with Crossfire i have both LCDs hooked up to one vidcard. When in games it kicksthe Main LCD into crossfire mode(only if in fullscreen) and leaves the secondary LCD in normal mode showing my desktop. Now if i Hook up a 120Hz LCD that needs 2 DVI ports as my Main will it still crossfire the main display and would i just then hook up the second LCD to the second VidCard? I guess what i dont understand is, does crossfired cards only send the Crossfire signal through the primary DVI port? If it does, I dont see how it would crossfire both DVI ports for one LCD.. Any light on the subject would be of great help.

 

[Druneau]

I don't think you need two DVI ports for normal 120hz lcd (at least not for 1680x1050 or 1920x1080).

 

[dr.stevil]

What LCD are you referring to? I can't think of any that require 2 DVI inputs.

I do know that they require a dual-link DVI cable for the bandwidth, but I don't think they actually need two DVI ports.

I'm currently running (or I was running) two monitors off of my 295 and haven't had any issues with it running in SLi mode with the second monitor hooked up or unhooked.

hope that helps ya

 

[GetFunk01]

Well i was reading somewhere that the 120hz LCD need 2 DVI ports hooked up due to bandwidth. If this is not true then i wont worry about it..Thanks.

 

[evilsofa]

Well i was reading somewhere that the 120hz LCD need 2 DVI ports hooked up due to bandwidth. If this is not true then i wont worry about it..Thanks.

The true 120Hz LCD monitors that run at 1680x1050 or 1920x1080 need a dual-DVI cable, which is different from using two DVI ports. A dual-DVI cable supports twice the bandwidth of a normal DVI cable, and 120Hz at 1680x1050 or higher exceeds the bandwidth available on a normal DVI cable. Those 120Hz monitors should ship with the appropriate cable, and I doubt there are any modern video cards that don't support dual-DVI.

 

[Mr_Coffee]

A single DVI cable can support two data links (dual-link), but it needs the pins/wires to support them. Dual-link needs to be specified for products that need it because not all cables and graphics cards support it. Have a look at this image for a general idea.