Benchmark Results: Media Encoding
You can tell which benchmarks are more heavily optimized to take advantage of parallelism. The overclocked FX-6100 and its six integer cores perform better in HandBrake and MainConcept. In those disciplines, the overclocked AMD CPU manages to just barely surpass the performance of a stock Core i5-2500K.
When it comes to iTunes and Lame, though, the FX's poor per-clock performance winds up getting it left in the dust.