Intel Dual Core Processors

I know that the new iMacs have Intel Core 2 Processors in them, and I am considering buying one next summer. It will run at a speed of 2.4 GHz. I have just one question on speed. When a processor is "dual core", does it have two cores running at 2.4 GHz each, or is it two cores running at 1.2 GHz each to total 2.4 GHz?
P.S.- This does not affect my descision of buying a Mac.

No it's not the same as having a 4.8GHz single processor. Like Duane said the total processor speed is 2.4GHz. However with 2 cores it's just like having 2 processors running at 2.4GHz each. This means the system can handle multiple tasks very well but the over all processor speed is still 2.4GHz. How much better than a single processor this is solely depends on what kind of applications you are running. Some applications are written to use multiple cores and some are not. Over all Mac OS X is designed to use multiple cores and practically all of Apple's applications will as well. So even in the case of a particular Application that can only uses 1 processor, the benefit is the rest of your Apps including the system can still be utilizing the other core simultaneously.
When comparing the C2D to a faster clocked Pentium 4, besides it being multi-core, it also has a much more efficient architecture. It creates less heat and has a larger on chip cache. Both equates to a better performing chip even at a lower clock speed. However real time speed differences will again completely depend on what you are running in comparison.
As for the video GPU you might take a look at these comparisons:
http://barefeats.com/imacal.html
http://barefeats.com/imacal3.html

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