All the fud and fuss about the Bulldozer being bad makes people believe Pentium III is a superior architecture.
No, my conclusion comes based on the idea that the Athlon II x4, with it's 4x 3-issue cores would probably match an FX-41xx with it's 2x 4-issue modules.
IIRC, the Athlon II has 128 bit FPUs per core, so on a per clock basis, I would think the Athlon II would match the FX-41xx and it's 2x split 256 bit FPUs. Of course the FX has an L3 cache and an enormous clock advantage.
As far as I can see, the FX-41xx would be a side grade, unless you have some kind of software that requires 256 bit FPU processing or just in general needs quite a bit of it. Games certainly can stress this, but general CPU performance is still completely necessary. I used to have a computer a while back with an Athlon II x4, and it surprisingly kept up pretty well with my Phenom II x4 system.