The Intel Core i9-12900K is the objective winner of this comparison, securing a lead in eight of the sixteen evaluated specifications. Its most significant advantage is its total core count, which is 167% higher than that of the alternative. While the Intel Core i5-12400F holds its own in five categories, it ultimately falls behind in the majority of technical metrics, though it maintains a 70% advantage in MSRP, representing its most impactful benefit over the higher-end model.

Users prioritizing raw processing capacity and multi-core performance should select the Intel Core i9-12900K for their build. Conversely, the Intel Core i5-12400F is the superior choice for budget-conscious buyers who want to maximize their value based on the MSRP. By choosing the latter, you sacrifice the substantial core count advantage of the former, but you gain a significant financial benefit that makes it a more cost-effective option for your specific hardware requirements.