Setting number of processors in PDM 4.0

Can anyone advise how the CPU setting for number of processors should be set on my Macbook Pro with Core2 Duo processors. Right now I have it set to 2 because even thought there's only one processor in the machine there are 2 cores. Performance is ok but I'm wondering if I would see better performance if I changed this setting from 2 to 1 or perhaps some other value. What think?

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