The Intel Core i5-14400 is the objective winner of this comparison, securing victories in ten out of fourteen measured specifications. Its most significant technical advantage is its L2 cache, which is 375% larger than that of the competing processor. This substantial increase in cache capacity provides the Intel Core i5-14400 with a clear architectural edge over the Intel Core i7-9700K, which only outperformed its successor in three specific categories during the evaluation.

Users prioritizing modern architecture and the efficiency of a larger L2 cache should select the Intel Core i5-14400 for their build. Conversely, the Intel Core i7-9700K remains a viable option for those who specifically require a higher base clock speed, as it maintains a 44% advantage in that metric. Choosing between these two components depends on whether your workload benefits more from the superior cache capacity of the newer model or the higher base frequency of the older unit.