[all variants] 3 GHz dual core processor - 3 GHz per core or 1.5 GHz per core?

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http://ubuntuforums.org – When it comes to multicore processors, if the frequency is rated as 3GHz, does that mean it is 3 GHz per core or 3 GHz divided by the number of cores. Like in the title, for a 3 GHz dual core, would it be 3 GHz per core or 3 GHz / 2 cores = 1.5 GHz per core? Thanks for your help. (Hardware)