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In About This Mac, it says that my Mac has a dual-core CPU, but Activity Monitor says that I have 4.

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I also checked this in Terminal with sysctl -n hw.ncpu but it also gave 4. If I have 4 cores, why does About This Mac say I have a dual-core CPU?

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It's two cores using Hyper-threading. That's an Intel idea that splits a core into two hypothetical cores, which allows for slightly more efficient multi-threading without any changes at the application-level.

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