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A dual core processor has two (mostly) independent CPU's. The operating system can assign them (this is called dispatching them) to two different threads at the same time. Theoretically, you could get twice as much done in the same period of time, but this depends on other things, such as cache hit/miss ratio, memory latency, and (the biggest part) whether or not the software is designed to run multi-threaded. It is also worth noting that most threads do not run all of the time - they start and stop, and they wait for other things - so dual core capability will not have that much of an impact in many cases.

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Q: What is application of dual core?
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