I've been hunting for info on this all over, but I haven't had any luck getting this particular question answered.
The specific scenario is this: I am buying a new conroe based PC asap, but I want to be able to play UT2k7 (no other games matter to me) on it without spending a huge amount of money on the current top-of-the-line GPUs. I have doubts that anything less than an X1900 will be able to run UT well or at all. I also don't want to wait 4-6 months to buy my computer.
If I buy a Xfire capable board and an X1600 at the end of this month, will I be able to add a DX10 card to the setup and use the X1600 for physics in the future?
I ask because although many places have said that assymetrical xfire will be available by the end of the year, they don't say whether they mean a 3 PCIe motherboard for a 2+1 setup, games that support hardware physics, or a hardware or software update to Xfire boards which makes assymetrical Xfire possible on them.
The other option would be to get a mobo with either integrated graphics or a cheap video card, which I would throw away later. The video card, not the motherboard.
More about :current xfire motherboards support assymetrical physics