A three monitor rig is wonderful for software development. I run the IDE
on the central 24" monitor, the reference document (design, or whatever)
on the right 17" monitor, and the program under test on the left 17"
Yes, according to ATI it is possible via the Device Manager by disabling
ACPI on the Computer property page. Then on the Device Manager property
page for one of the monitors, Resources tab, uncheck "Use automatic
settings" and assign the IRQ by hand.
I haven't tried that yet. While having to do a special startup song and
dance is a PITA, it does work and I'm worried about destablizing my system.
If you get your three monitor rig running OK, please send me an email
and tell me how you did it.