The AMD Ryzen 7 3800X 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 increase in cache capacity provides the primary performance edge for the Ryzen processor across the evaluated metrics, establishing it as the superior component based on the total number of winning specifications.

Users prioritizing high-performance computing tasks should select the AMD Ryzen 7 3800X to leverage its superior cache architecture. Conversely, the Intel Core i5-8400 is the appropriate choice for those who specifically require a lower Max Turbo Power, where it holds a 54% advantage over the Ryzen. Choosing between these two components depends on whether your workflow benefits more from the increased cache capacity of the Ryzen or the power efficiency profile of the Intel processor.