The AMD Ryzen 9 9900X is the objective winner of this comparison, securing victory in seven of the fourteen evaluated specifications. Its most significant technical advantage is the L3 cache, which is 113% larger than that of the Intel Core Ultra 7 265K. This substantial lead in cache capacity provides the primary performance edge for the AMD Ryzen 9 9900X across the measured metrics, establishing it as the more capable option based on the total spec-win count.

Users prioritizing the benefits of a larger L3 cache should select the AMD Ryzen 9 9900X for their build. Conversely, those who require the specific advantages offered by the Intel Core Ultra 7 265K should opt for that processor, as it features an L2 cache that is 200% larger than the alternative. Choosing between these two components depends entirely on whether your workload benefits more from the superior L3 cache capacity or the significantly larger L2 cache.