The Intel Core i9-14900KS is the objective winner of this comparison, securing victory in ten out of fourteen measured specifications. While the Intel Core i5-10400F holds its own in three categories, the most significant performance advantage belongs to the Intel Core i9-14900KS, which features an L2 cache that is 2033% larger than that of its counterpart. This substantial architectural lead highlights the superior technical capacity of the newer processor across the majority of the evaluated metrics.

Users prioritizing budget efficiency should select the Intel Core i5-10400F, as it offers an MSRP that is 78% better than the alternative. Conversely, those who require maximum technical specifications and the benefits of a significantly larger L2 cache should choose the Intel Core i9-14900KS. The decision rests on whether the user values the cost-effectiveness of the former or the extensive hardware advantages provided by the latter.