http://www.guru3d.com/article/Videocards/337/
Link is for wrong page, try this one;
http://www.guru3d.com/article/Videocards/337/2/
Second the reviewer doesn't know what they are talking about. He's got the DVI limit on the dual-link cards, but forgets they still have 400mhz RAMDACs and thus support the same full range as all other VGA cards. His list is particularly ignorant based on the following statement;
"you will still be limited towards 2400 x 600 vertical pixel lines. That's just not acceptable in my book.
It's unacceptable in my book too, and completely incorrect of course.
The 3D window in a 2D desktop may be correct, however based on the 2D and 3D information I'd question that too as it seems more like a cut and past since obviously the actual support is far higher as people have gamed and benchmarked at that level.
There seems to be a driver support issue for windowed 3D applications, but that would be different that what you're stating, because it's definitely not a hardware limit of the parts Xfire or no, which would be the same as the nV cards. In fact read further;
"In short, ATI cards of course can easily support it yet at the moment of writing ATI refuses to cooperate to get this fixed for unnamed reasons."
Sounds like a driver issue, and sounds like a "we don't want to help the competition who hasn't let us use their
SurroundGaming solution".
Also the author makes it seem that it could be solved tomorrow if ATi really wanted to, and also sounds like something I or anyone could solve with a few tweaks from the right people on Rage3D or 3Dcenter.
As much as I love Matrox, 3rd party apps (as in appliances/applications) don't dictate the limitations of Xfire itself, just the support for their own brand of whatever. completely different issue than what you were first refering to since the 19x12 is a hardware limit not software.
PS, the author also seems to ignore the hardware limits of DVI when he writes about a possible DVI version of the TripleHEad;
"it would probably allow me to go triple 1920x1200 = 5760x1200
"
Where does he think this 5760x1200 source is going to come from? Definitely not nV's nor Ati's mass single link cards (which would barely do one of those panels, not 3). Sounds more like some confusion on his part.
I never said it was a hardware problem, I think it just stupid that ATi fails to cooperate and support it.