Sorry for the delay,
I believe there is a "master" and "slave" to Crossfire unlike SLI, where you are correct that it takes identical cards.
When I posted this question I was getting scores around 8000+ on 3DMark06.
After this post, ATI came out with some improved drivers for the x1950's. I installed them and am now getting over 11000 on 3DMark 06.
Submition of the results show that it is in compitition with 7900 SLI rigs... so I am gathering that the crossfire is working.
Thank you a lot for replying Taco.
Take care,
J.