Over the past few months we have been lucky enough to have access to 2 different AMD 64bit processors, the Athlon 64 3200+ and the Opteron 146. We were completely impressed by the Opteron 146 and the Athlon 64 3200+ wasn?t half bad either. Today we have the opportunity to take a look at the final desktop model in the AMD series ? the Athlon 64 FX-51. We shall also put a Pentium 4 3.0ghz and Athlon XP 3200+ into the mix to complete the comparison.