At work I've got a Radeon X1300 and I'm thinking of borrowing another to get three monitors attached to my computer.

I saw that most >2 monitor setups are done with xinerama, which unfortunately means that 3d acceleration goes out the window.

Since most posts about setups like these are a bit old, now that we've got PRIME and gpu offloading and DRI2 and whatnot, is there a better way to do triple head without loosing 3d? Obviously with a X1300 it's not for gaming, but I would like to still be able to run compiz and unity.