Dual cores and triple cores here. (yep)
Quad cores at work and at Barry's.

They all seem to do fine. I'd check speed to be above 2gHz for the processor though.
More above the better.

I tend to think processors are not the bottleneck for most systems. As Mac mentioned; RAM is big, then disk/data buss are more suspect here.
You'd be surprised how often most processors are waiting/looking for something to do.
That said, RB and BiaB do push the processors during generation, but again I bet other parts of the system are what make the generation take longer, not the processor.

Just my opinion from personal observation.


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