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An i3 processor has 2 cores.An i5 processor has 2 or 4 cores (depending on the model you have.)
An i7 processor has 2, 4 or 6 cores (depending on the model you have.)..The next question is What is a Core?
A standard processor has one core (single-core.) Single core processors only process one instruction at a time (although they do use pipelines internally, which allow several instructions to be processed together; however, they are still run one at a time.)
Do your word processing, spreadsheets etc. on your PC, listen to music often, and watch movies, get a dual core or i3.
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