The AMD Ryzen 9 9900X is the objective winner of this comparison, securing victories in eight out of fourteen evaluated specifications. Its most significant technical advantage is its L3 cache, which is 78% larger than that found in the Intel Core i9-13900KF. This superior cache capacity serves as the primary differentiator between the two processors, establishing the AMD Ryzen 9 9900X as the more robust option across the majority of the measured hardware categories.

Users prioritizing the specific benefits of a larger L3 cache should choose the AMD Ryzen 9 9900X for their build. Conversely, those who require the unique architecture of the Intel Core i9-13900KF will find its primary advantage in the L2 cache, which is 167% larger than the competitor's offering. Selecting between these two components depends entirely on whether your workload benefits more from the increased L3 cache of the AMD or the significantly larger L2 cache of the Intel.