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They are treated exactly like two separate CPUs. Any operating system that can use multiple CPUs can also use a processor with multiple internal cores, with no changes needed to the code.

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Q: How do operating systems handle Multi-core CPUs?
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Related questions

What type of CPUs are x64 operating systems and software primarily designed for?

64-bit


Are most operating systems today designed for either 16-bit or 32-bit CPUs?

Most operating systems are designed for either 32-bit or 64bit CPU's.


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What is a 32?

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What are the disadvantages of 233 MHz computers?

The main problem is that such computers are way too slow for today's operating systems and applications. Today, the problem isn't so much the clock rate, but the fact that the CPUs used much less efficient instructions and were not multicore like today. The companies could make more efficient computers than what was produced back then if they wanted to, and using that same clock rate. Plus the memory during that time period was very slow.


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