Yeah, I'm running a Crossire setup using 2 X1900XTs - picked up the master card for less than half what the original XT card cost me! :thumbup:
I haven't noticed any issues running Crossfire in any games (except Medieval 2 won't start when Crossfire mode is active) and the SuperAA looks, well, super!
This is all on an Opteron 175 at 2.93Ghz using the latest Catalyst drivers (7.1)
Formski