Per the article, the clock speed difference is much smaller than the ~4x performance difference (4.5 GHz vs 2.6 GHz, i.e. 1.7x). So more than half of the perfor

Per the article, the clock speed difference is much smaller than the ~4x performance difference (4.5 GHz vs 2.6 GHz, i.e. 1.7x). So more than half of the performance advantage of the P cores has to come out of the uarch difference (wider structures etc.). Meanwhile there will be other factors besides clock frequency, e.g. the P cores might use a different cell library than the E cores.