Dual graphics cards is unsupported (meaning we are unable to provide tech support) since we have no way to create the same/similar setup.
With that said you can use more than one card.
What is important is that you don't share/mix video from one output path to another.
So if you:
add a movie player, and connect its output to stage 1 (using gpu1)add a movie player, and connect its output to stage 2 (using gpu2)Don't try to mix the two videos together in any way.. keep them separate. Mixing will require moving the texture from one gpu to the other, and will be a spped/bottleneck.
No Isadora allows you to move video in anyway you like, so its very flexible. If you can keep the video flow simple, and maintain individual paths, you can make it work very well.
TEST, TEST, TEST!
Start simple, and build up.. test constantly