The Intel Core i9-14900KF is the objective winner of this comparison, securing victory in nine out of sixteen measured specifications. Its most significant technical advantage is its L2 cache, which is 327% larger than that of the alternative. While the Intel Core i5-12400F holds its own in four categories, the superior cache capacity of the higher-tier model represents the most impactful performance-related difference between these two processors.

Choose the Intel Core i9-14900KF if your primary requirement is the expanded L2 cache capacity provided by its architecture. Conversely, the Intel Core i5-12400F is the logical selection for users prioritizing the MSRP, where it maintains a 69% advantage over the more expensive option. Selecting between these two components depends entirely on whether your build demands the cache-heavy performance of the flagship model or the cost-efficiency offered by the entry-level unit.