Currently i have a PLP configuration consisting of 2 portrait 1600 x 1200 dell 2007fp monitors and a 2560 x 1600 dell 3007wfp monitor and one thing many people have been waiting for is an eyefinity solution to allow for different orientations of monitors to be used with eyefinity. However this is not supported.
I currently have all 3 monitors working through a single 5850 and they are in crossfire. 2 are connected with DVI and the third using the Display port to VGA adaptor. Since i was curious how eyefinity would look i tried setting my monitor orientation back to Landscape on all 3 and tried a 1600 x 1200 * 3 combination for just cause 2 and then recently switched back to my PLP combo. However just cause 2 retained my settings for 4800 x 1200 resolution then booted up in windowed mode. This worked no problem across all my 3 monitors which got me thinking. If its happily doing it this way then surely if i can modify the resolution to whatever i need then it will simply span my 3 monitors, so i changed the launch options to force 4960 x 1600 resolution in windowed mode ( needs to be windowed or this trick wont work - also meaning crossfire wont work )
I then proceed to boot the game up and low and behold it works just fine. Performance is still decent even though its only off 1 GPU and its MILES better than any soft TH solution because there is no laggy monitors. The main downside is simply its in windowed mode.
forgive the following picture quality, my shoddy phone =(
Here are a few videos ( also from my phone ) - Audio and video horribly out of sync and video is at the wrong framerate. Woops. But you get the idea.
http://www.boxrick.com/justcause1.mkv
http://www.boxrick.com/justcause2.mkv
http://www.boxrick.com/justcause3.mkv
I then thought id give another game a go, so i tried Penumbra - Black Plague and this time modified the settings file and again set the resolution to 4960 x 1600 and windowed mode. The game started off hugely off centre but a simple window drag and it spanned my 3 monitors and again worked fine.
http://www.boxrick.com/penumbra.mkv
Hope this helps a few people. :rockout