OK, My bad. Its 1,1.
How I got to this point as far as hardware.
the MacPro came with the 9800XT.
I bought an apple cinema Display with mini display port.
I then bought the HD5800.
I'm happy with what I have it works great in 10.6.7
That said my question still stands, I think.
Will XP simply not allow me to use these two cards?
Will windows 7 x64?
This is a simple matter of because its there and the ability to fire up steam and play the games my buddies are.