Well, this could be a good thing in the long run. If the software can use the Nvidia cards for the same effects, we could hopefully get the quadro 4000 card with SDI out eventually for the mac..
http://www.nvidia.com/object/IO_20375.html

It seems as though this card can handle doing all the effects, while outputting HD/SDI so we would finally have an integrated SDI output solution. That would be a dream come true for me.

Jason