Yes, the older Intel series CPUs were more similar to each other.
Yes, the older Intel series CPUs were more similar to each other.
Not everyone had four cores. Desktop Pentium chips were 2C/2T, i3s were 2C/4T, i5s were 4C/4T, and i7s were 4C/8T. On the mobile side, Pentiums remained 2C/2T, i3s and i5s stayed at 2C/4T, and most i7s were 4C/8T—though some of the older U-SKU 2C/4T models were included to show Intel's occasional mistakes.
Hyperthreading provides a noticeable boost. Results differ depending on the software, but typically around 30-40%. Even with similar core counts, the higher speeds and hyperthreading support make the i5 and i7 perform comparably well. Currently, the i5 offers six cores while the i7 has eight, plus the i7 runs at a slightly faster clock speed. Therefore, the performance gap remains relatively consistent.