The AMD Ryzen 7 3700X is the objective winner of this comparison, securing victory in ten out of fourteen measured specifications. Its most significant technical advantage is the L3 Cache, which is 256% larger than that of the Intel Core i5-8400. This substantial lead in cache capacity positions the AMD Ryzen 7 3700X as the superior component for users prioritizing high-end technical specifications and hardware performance across the majority of the evaluated categories.

Users who require the highest level of technical capability should choose the AMD Ryzen 7 3700X for its clear lead in cache and overall spec count. Conversely, the Intel Core i5-8400 remains a viable option for budget-conscious buyers, as it holds a 45% advantage in MSRP. Selecting between these two processors depends on whether your priority is maximizing hardware specifications or minimizing the initial cost of your build.