The AMD Ryzen 7 8700G is the objective winner of this comparison, securing victories in eleven out of fourteen measured specifications. Its most significant technical advantage is the L2 cache, which performs 433% better than that of the Intel Core i5-8400. This substantial lead in cache capacity positions the AMD Ryzen 7 8700G as the superior choice for users prioritizing modern architectural efficiency and high-performance data handling capabilities over the legacy specifications offered by the alternative.

Users should select the AMD Ryzen 7 8700G if they require the latest hardware standards and the performance benefits provided by its vastly superior L2 cache. Conversely, the Intel Core i5-8400 remains a viable option for budget-conscious builders who prioritize a lower MSRP, which is 45% better than the competitor. Choosing between these two components depends entirely on whether your primary goal is maximizing technical throughput or minimizing the initial cost of your build.