I am not so sure about that, while CrossFire is more forgiving than is SLi in terms of not requiring identical cards with identical BIOS as I understand it you still need cards of the same model. Maybe you could get away with an x800XT and an x800XL but I have not heard you can and even if you could I am certain it would only run as duals of the lower card. This is true with ram volume too so if you had a 256 and a 512 card then it would run as a dual with 256x2 not 768.
Whichever is the case, I wouldn't want to buy a x1XXX only to have it run in dual setup and be limited to running the lower cards ability. The next gen coming out is quite another leap forward (RD580 for ATI (x1900XTX) and G71 for NVIDIA) - they will be quite a change in architecture, at least the ATI is goign with a theory of more registers over mroe pipelines.
|