You can use dual monitor support with MorphOS, but it currently does not work using the same graphic card driver for both screens.
So you cannot use two radeons, as both use the same radeon driver. The resolution of the screen does not matter. Any combination will work, as long as it is supported by the used Graphics card.
I use a Voodoo3 PCI together with a Radeon9000 in a PowerMac G4, which works fine.
Geit
