GHz is simply how often the computer updates the processor with data. The number of cores has nothing to do with it. The number really doesn't matter in the big picture.
Your 2.4 ghz i5's cores are likely twice as fast as some 4.0 ghz FX processors. It doesn't include how much data the processor core can handle. It's only useful when you are manually overclocking your processor, or you are comparing two processors of the same architecture.
And just to clarify further, more cores doesn't mean the processor will be faster either. Computer's can't automatically divide instructions to multiple cores at the same time, a program has to be specifically written for that. Right now most games only use 4 cores.
Some claim to use 8 but I've yet to see any of these multi core games actually use 100% of a multi core processor. They seem to more use 100% of one core, then 20% of the others.
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