* For a given generation, the i3, i5, and i9 are literally the same die, although some will run at lower clock rates or have cores deactivated.
* For most people and most applications, you’re typically using between 0 and 2 P-cores. The other P-cores and the E-cores are idle.
* Even for heavy users, some cores (esp the E-cores) aren’t doing much.
* Thus, a lot of the difference comes down to clock speed. But, a core at 4 GHz that’s idle 3/4 of the time is doing as much as a core at 3 GHz that’s idle 2/3 of the time.
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