it should be more or less the same. The big interest is in putting 2 of them together and see if thats more effective than tri-sli, which seems a bit half-baked right now. By the time AMD feel ready to field 3870x2, tri-sli might have matured quite alot. But then again its only for the wealthy. i should think the 3870x2 will perform like regular crossfired 3870's, much the same as the nvidia gx2 performed like 2 slower clocked 7900gtxs in sli.