The AMD Ryzen 9 9900X is the objective winner of this comparison, securing victories in ten out of fourteen measured specifications. Its most significant technical advantage is the L3 Cache, which is 220% larger than that of the Intel Core i5-12600KF. This substantial capacity increase represents the primary performance differentiator between the two processors, establishing the Ryzen 9 9900X as the superior option for users prioritizing high-end hardware specifications and cache-dependent operations.

Users should choose the AMD Ryzen 9 9900X if they require the technical benefits provided by its superior L3 Cache and overall spec-win count. Conversely, the Intel Core i5-12600KF is the appropriate selection for budget-conscious buyers, as it holds a 47% advantage in MSRP. By weighing the cache capacity against the cost savings, consumers can align their purchase with either the performance-oriented architecture of the Ryzen or the financial efficiency of the Intel processor.