The AMD Ryzen 7 5700X is the objective winner of this comparison, securing victories 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 increase in cache capacity represents the primary performance differentiator between the two processors, establishing the Ryzen 7 5700X as the superior option across the majority of the evaluated hardware metrics.

Users prioritizing raw technical specifications and the benefits of a significantly larger L3 Cache should choose the AMD Ryzen 7 5700X for their build. Conversely, the Intel Core i5-8400 remains a viable alternative for budget-conscious consumers, as it holds a 39% advantage in MSRP. Selecting between these two components depends on whether a user values the performance-oriented cache capacity of the Ryzen or the lower initial cost offered by the Intel processor.