The AMD Ryzen 7 5700X3D and the Intel Core i5-12400 are objectively tied, with each processor winning six out of fourteen comparable specifications. The most impactful advantage belongs to the AMD Ryzen 7 5700X3D, which features an L3 cache that is 433% better than its competitor. This significant disparity in cache capacity represents the primary technical distinction between these two hardware options, as the Intel Core i5-12400 offers an 88% advantage in L2 cache capacity.

Users prioritizing the massive L3 cache capacity should select the AMD Ryzen 7 5700X3D for their build. Conversely, those who require the specific benefits provided by the superior L2 cache architecture should opt for the Intel Core i5-12400. Because both components share an equal number of winning specifications, the final decision rests entirely on whether your specific computing needs are better served by the substantial L3 cache advantage or the notable L2 cache improvement.