The Intel Core Ultra 7 265KF is the objective winner of this comparison, securing victories in eleven out of fourteen measured specifications. Its most significant technical advantage over the Intel Core i5-9600K is its L2 cache, which is 2300% larger. While the Intel Core i5-9600K maintains a lead in Max Turbo Power with a 62% advantage, the superior cache capacity of the Intel Core Ultra 7 265KF establishes it as the more advanced component across the majority of categories.

Users prioritizing modern architectural specifications and the massive L2 cache advantage should select the Intel Core Ultra 7 265KF for their build. Conversely, the Intel Core i5-9600K remains the appropriate choice for those specifically seeking the higher Max Turbo Power capacity provided by that unit. Your final decision should depend on whether you value the extensive cache improvements of the newer model or the specific power profile offered by the older processor.