It seems like so long ago that AMD had the popular high end FX range. But, it was put to the side with the Phenom and Phenom II series processors as it just couldn't compete in higher end market segments, also because AMD did not want to dilute the FX identifier.
Enter "Black Edition" which was the model with the unlocked BClk multipliers. But now AMD are bringing FX back with the new Bulldozer architecture, which gives the processor a much higher degree of inter-core integration, sharing of common components, higher instructions per clock-cycle and Advanced Vector Extensions (AVX).
AMD's Bulldozer "Zambezi" desktop chips are supposedly going to come in form of two ultra high-end SKUs: the 8-core AMD Vision Black FX and performance segment AMD Vision Ultimate FX.
Good times ahead for AMD in 2011!