Hi there and welcome to the limits of the DVI standard :lol:
Here are some facts that you might find useful :
1) Ati cards seem to be limited to 3x 1440x900 with TripleHead2Go, because
they can't output the lower-than-60Hz refresh rates required by TH2G to achieve 3x 1680x1050.
SoftTH has no such limitations.
2)
You can't use 30" panels with TH2G afaik anyway. Even at lower-than-native resolutions. I tried to use my 30" panel as the center screen, to go with 19" side panels, just for kicks. It didn't work. Even in single screen mode, I couldn't get the 30" panel to display my desktop. All I got was single colors all over the panel (red, then green, then yellow etc.)
3)
For a triple-30" display your only option is SoftTH. With no guaranteed results. You'll need 3 active outputs, which means no Crossfire.
4) Final advice : you'd be so much better off with three 1920w or smaller panels... any size but the 30" monsters. What you'd "lose" in pixel count will be a much-needed gain in flexibility. TH2G will work wonders (even though at a lower res), and SoftTH will still be an option for higher res's. (Besides, even the most powerful GPUs to come would crawl with 3x 2560x1600 pixels to display, but that's another story) :lol: