The AMD Ryzen 9 5900X is the objective winner of this comparison, securing a lead across seven of the fourteen evaluated specifications. Its most significant advantage over the Intel Core i7-12700K is its L3 cache capacity, which is 156% larger. This substantial memory buffer provides the primary technical edge for the AMD processor in this head-to-head matchup, establishing it as the superior choice based on the total count of winning specifications.

Users prioritizing the massive L3 cache advantage should select the AMD Ryzen 9 5900X for their build. Conversely, those who place a higher value on L2 cache capacity should opt for the Intel Core i7-12700K, as it offers a 100% advantage in that specific area. Choosing between these two components depends entirely on whether your specific workload benefits more from the superior L3 cache of the AMD option or the doubled L2 cache provided by the Intel alternative.