crossfire is an infant at the moment, it needs more support, more nurturing, and i don't doubt crossfire will become just as fast as SLI, perhaps even faster (if were talking 7900 and X1900 in which X1900 is faster of the two in most cases, meaning in ideal circumstances and if ATI can get crossfire more efficient should have no problem beating two 7900 in SLI)
after reading a few reviews on it, SLI vs crossfire seems to follow the exact same pattern as X-whatever vs G-whatever, a lot of these reviewers are conducting unfair tests in my opinion though, compairing lesser ATI cards to newer nvidia cards, such as X850 crossfire vs. 7800GT SLI, the X850 was around to destroy nvidias 6800 series, not take on nvidias next-generation architecture, there coming to all sorts of ballsy conclusions about crossfire being inefficient and not as fast. the only way i'll remotely believe any of this is true is 1) reviewers not going 'oooh the 7800GT won in doom 3 :-O, because nvidias have always been faster in doom, similar to ATI and far cry, as far as i can see ATI > nvidia with cry. 2) stop compairing newer SLI chipsets to the first generation crossfire chipset and finally 3) compair competative cards for instace X1800 against 7800, not something ridiculous like 7800GTX in SLI against a couple of X850s, thats an unfair test and nobody here can come to any conclusions on which is the best setup without conducting some real-life fair tests (and like i asked in CPU thread, this is not an excuse for people to preach about any vast knowledge of how GPUs work or anything, people say reviews are good reading, people trust reviews, so im just taking there advice, thanks)