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Audio Encoding Benchmarks
Apple’s iTunes wants clock speed and performance per clock cycle since it isn’t optimized to take advantage of multi-core processors.
The same applies to Lame. The Core 2 Duo E8600 at 3.33 GHz is tops here.
Video Transcoding Benchmarks
AMD’s Athlon II X4 620 can beat its main competitor, the Core 2 Quad Q8200, in the DivX video transcoding benchmark.
However, AMD’s chip cannot beat the Q8200 in the same test using the XviD codec.
The MainConcept H.264 encoder is well-optimized to take advantage of multiple cores, explaining why the new Athlon II X4 does really well in this benchmark.