X1800 & X1900 Series Crossfire
With the arrival of the X1800 series, the limit on Crossfires resolution was removed, due to a move to dual Link DVI and an upgraded compositing chip. Along with the vastly increased performance of both the X1800 and X1900 series over the X800 series, it made Crossfire a much more likely competitor to 7 Series SLI.
There are other advantages being talked about, such as the introduction of mastercard-less X1800 series crossfire in a future driver update. X1600 series crossfire can already be enabled without a mastercard or crossfire cable if you are in need of a midrange solution. All this enhances Crossfires appeal.
In many tests now X1900 series Crossfire is proving to be the performance leader where mutli-GPU systems are concerned.
Your can find more details on X1800 series crossfire
HERE,
HERE and
HERE and dont forget
GURU 3D's take either!
You can find details on X1900 series crossfire as part of Anandtechs X1900
review, as well as
HERE,
HERE and of course on
GURU 3D