The Intel Core i9-14900 is the objective winner of this comparison, securing victory in seven of the fourteen evaluated specifications. Its most significant technical advantage over the Intel Core i5-12400F is its L2 cache, which is 327% larger. While the i5-12400F holds its own in four categories and leads in three, the superior cache capacity of the i9-14900 provides a substantial architectural edge that defines its performance profile in this head-to-head assessment.

Users prioritizing budget efficiency should select the Intel Core i5-12400F, as it offers a 68% advantage in MSRP compared to the alternative. Conversely, those who require the advanced technical specifications and expanded L2 cache capacity provided by the Intel Core i9-14900 should opt for the latter. The choice depends entirely on whether the buyer values the significant cost savings of the i5-12400F or the superior cache architecture found in the i9-14900.