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It was only when Intel developed the Core Duo that they had more than one core or processor per chip

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The 486 CPU was the first CPU Intel made which utilized a single processor chip for all functions. Before it, processors such as the 286 and 386 utilized two processors (an ALU and a math coprocessor) to perform tasks, as they could not fit both functions onto one.

Now, all processors have a built-in ALU and math-coprocessor. As of the Intel Core Duo they contained two separate cores in a single processor. It is still, however, a single processor! It just has two cores and thus can function as two separate CPUs. This trend continued in the Core 2 Duo line.

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Q: How many processors does the 80486 CPU have?
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