I have a question. I am thinking of getting a new card. Since 7900's are just around the corner, it might be a good chance to get a cheap 6950 or 6970. Before I choose between AMD or Nvidia I would like to know if I can use a Xfire array with my old and new card, and if it's worth it. If yes, that's one extra point towards staying with AMD.
if you use a board that runs the lucid hydra chipset, you can run a-mode fusion to use a 5770 and a 6950 together. but there wouldnt be much of a performance improvement, if any at all.