The Intel Core i5-14400 is the objective winner of this comparison, securing more individual specification victories than the Intel Core i5-12600K. While the latter holds a notable lead in base clock speed, which is 48% better, the Intel Core i5-14400 provides a more significant advantage in memory capacity. Specifically, the Intel Core i5-14400 offers a 50% higher maximum memory limit, making it the superior choice for users prioritizing memory-intensive workloads over raw base clock frequency.

Choose the Intel Core i5-14400 if your primary requirement is supporting larger memory configurations for your system. Conversely, select the Intel Core i5-12600K if your specific use case benefits more from a higher base clock speed. Because these two processors tied in seven of the fourteen measured categories, your final decision should rest entirely on whether you value the increased memory ceiling of the newer model or the superior base clock frequency of the older unit.