thanks jon. i guess if i xfire i'll just buy another 1 GB model.
one more addition - would it be better to just upgrade to the 2 GB model, or xfire 2 1 GB 5850s? i've heard 1 card > 2 cards xfire.
definitely to 2 1gb over one 2gb model, the only time would be at 2560 1600, and the few games that aren't supported by cf