With the recent total change in apple architecture - and consequent unpredictable performance - v4 concentrates on safety for now.

v4 has been tested a little on the new g5's with pci express and seems to work without any serious problems.

v4 works with ATI and nVidia cards, doesnt use any technology specific to any graphics vendor.

I am still waiting for scsi cards and decklink cards that are pci-express.

Dont have a quad g5, and have no idea - at all - what the performance will be.

There have been reports on apple developer lists, of dual graphics cards working, but almost nothing has shipped to end-users yet.