AMD is going to have a tough time against Conroe. Even AMD hard-liners like me are starting to see blue, and that's something of a big deal. It does not make any logical business sense to debut the 4x4 on the FX line only, as that castrates the bulk of your potential buyers. While AMD has not announced X2 support for 4x4, it is a reasonable and logical conclusion to draw.
Stop being a black cloud.