Jaypee wrote:

> Generally, the generation of processor (G4 vs. G5) alone is responsible 
> of a similar difference at equal clock frequencies. But here, I expected 
> a bigger difference given the combined effect of a higher clock, a 
> higher generation and a dual CPU.
>

I don't think Ruby takes advantage of the 2nd CPU. The script runs on 
only 1 CPU, so all the benefit you're seeing is from the faster clock speed.