The AMD Ryzen 5 7600X is the objective winner of this comparison, securing victories in nine out of fourteen measured specifications. Its most significant technical advantage is its L2 cache, which is 300% larger than that of the Intel Core i5-8400. This substantial cache capacity provides the primary performance edge for the newer processor, establishing it as the superior choice across the majority of the evaluated hardware metrics.

Users prioritizing modern architecture and high-speed data handling should select the AMD Ryzen 5 7600X to leverage its massive L2 cache advantage. Conversely, the Intel Core i5-8400 remains a viable option for those specifically seeking a lower Max Turbo Power, as it holds a 54% advantage in that category. Choosing between these two components depends on whether your specific workload benefits more from the expanded cache capacity or the power efficiency profile provided by the Intel unit.