The Intel Core Ultra 5 245KF is the objective winner, securing victories in eleven out of fourteen comparable specifications. Its most significant technical advantage is a 1633% larger L2 cache compared to the Intel Core i5-10400F. This massive increase in cache capacity provides the newer processor with a substantial architectural lead across the majority of measured categories, establishing it as the superior component in this head-to-head comparison.

Users prioritizing raw architectural performance and memory efficiency should select the Intel Core Ultra 5 245KF to leverage its extensive cache advantage. Conversely, the Intel Core i5-10400F remains the appropriate choice for those who prioritize power efficiency, as it maintains a 48% advantage in TDP. Choosing between these two processors depends entirely on whether your specific build requirements favor the higher thermal efficiency of the older model or the significant cache capacity of the newer one.