The Intel Core i7-12700K is the objective winner of this comparison, securing victory in nine out of fourteen measured fields. Its most significant technical advantage over the Intel Core i5-8600K is its L2 cache, which is 700% larger. While the older processor maintains a 50% advantage in Max Turbo Power, the superior cache capacity of the newer model provides a substantial architectural lead that defines its overall performance superiority in this head-to-head evaluation.

Users prioritizing modern architecture and high-capacity cache should choose the Intel Core i7-12700K for their build. Conversely, the Intel Core i5-8600K remains a viable option for those specifically seeking the higher Max Turbo Power rating provided by that unit. Selecting between these two components depends on whether your primary requirement is the expanded cache efficiency of the newer generation or the specific power profile offered by the older i5 model.