Clock Speed what does it mean? [closed]

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lets say i have a dual core having a speed of 2.7. Does the 2.7 stands for the sum of the speed of each core, or the speed of each individual core?

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It means that each CPU core runs 2.7 billion cycles per second. This has a lot less meaning than it used to, as the amount of "work" that is completed each cycle varies quite a bit (due to considerations like caching, pipelining, hyperthreading, memory access times, and so on).

If you want to know how fast a processor is, it is much more advisable to look at benchmarks related to the kind of tasks you are trying to accomplish with it than to look at the clock speed. Consider: a dual-core 2.4 GHz Core i5 is much, much faster than a 2.4 GHz Pentium D (also dual-core).