The AMD Ryzen 9 7900X3D 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 967% larger than that found in the Intel Core i7-8700K. This substantial disparity in cache capacity serves as the primary differentiator between the two processors, establishing the former as the superior component across the majority of the evaluated hardware metrics.

Users prioritizing high-end performance and the benefits of a massive L3 cache should select the AMD Ryzen 9 7900X3D for their build. Conversely, the Intel Core i7-8700K remains a viable option for those specifically seeking a lower Max Turbo Power, where it holds a 41% advantage over its competitor. Choosing between these two parts depends on whether your system requirements favor the expanded cache capacity of the newer architecture or the specific power profile of the older model.