As we have already seen several times, WAV-files compression into mp3 format loads the computational units of the CPU in the first place. Besides the codec we are using supports Hyper-Threading, which allows Pentium 4 processors to perform very well in this test. As for Athlon 64 3200+, it doesn’t run very fast because of the pretty low clock frequency of only 2GHz. Moreover, I would also like to draw your attention to the fact that we see Athlon 64 3200+ outperforming Opteron 146 here, even though the latter features dual-channel memory subsystem. It is exactly what I have already warned you about: due to lower memory latency Athlon 64 manages to outperform Opteron working at the same clock frequency.
During MPEG-2 encoding in Canopus ProCoder 1.5 AMD processors show their best. Athlon 64 3200+ is no exception again. It manages to be one of the fastest here. It even outpaces Opteron 146!
The tests of MPEG-4 encoding speed name Pentium 4 CPUs as winners. As for Athlon 64 3200+, it runs almost as fast as Opteron 146, being just a little behind Athlon 64 FX-51 and a little ahead of Athlon XP 3200+.
A similar picture can be observed in case of Windows Media Encoder version 9.