Crossfire 2 + 1

I am gathering up all the stuff needed to build a high end crossfire rig for a friend. I currently have 2 x X1900XT...one is a master card. I was curious about adding a physics card.

Do I just use any X1xxx series card, or is there a certain card I need. Also how does this get configured in the system?

Thanks -Jim

P.S. I also have a case, CPU, X FI Plat, TT120 and HDDs.

I am about to order the PSU as sugested to me in the PSU forum here. I have a current question in the Intel mobo section as well concerning the new DFI Intel board.

Thanks again -Jim

It's not being supported/used in any game atm Im pretty sure

It's in the developmend stage at the moment, so you'll have to wait a bit..