You might ask

"Is it possible to get 3 video outputs on three separate full screen monitor outputs?"

Yes it is. As long as you dont want any fancy catalyst type graphics - just straight movies.

My development g5 has 3 screens, 2 come from the agp graphics card, and the blackmagic decklink has another desktop output that can be enabled, and used.

The blackmagic output can be switched into a straight sdi output as well. The movie output goes straight out the sdi output, no display on a mac desktop.