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Core i5 is a Dual Core processor line. It is Intel's mid-range processor series. It has many of the same features as the i7s including: Hyper Threading, Enhanced Intel Speed Step, and Turbo Boost. In addition to these features many Core i5s also include an integrated graphics processor on the die.
All core i3 series processors have : 2 cores. All core i5 series processors have : either 2 or 4 cores. All core i7 series processors have : either 4 or 6 cores. So you can easily conclude that the named series doesnât have direct mapping with number of cores e.g. i5 series microprocessors have both 4 and 6 cores.