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We'll start our video encoding benchmarks with MainConcept Reference:
What a profound impact more CPU cores make in this benchmark: from nine minutes on the single-core 2.7 GHz Core 2 processor, down to only two minutes and 30 seconds when all four cores are enabled. Clearly, if video encoding is your thing, a quad-core processor is a must.
Or is it? Let's see if TMPGEnc can offer the same advantages:
Here we see the effect of the encoder on the results. While DivX is highly optimized for multiple CPU cores, Xvid doesn't show as much of a benefit. Having said that, even Xvid shows about a 25% speed increase going from single to dual cores.