The AMD Ryzen 9 9900X is the objective winner of this comparison, securing victories in nine out of fourteen measured specifications. Its most significant technical advantage is its L3 cache, which is 256% larger than that of the Intel Core i5-12400F. This substantial lead in cache capacity positions the Ryzen 9 9900X as the superior choice for users prioritizing high-end hardware specifications and the performance benefits associated with a larger memory buffer.

Users who require the highest available specifications should choose the AMD Ryzen 9 9900X to leverage its massive L3 cache advantage. Conversely, the Intel Core i5-12400F is the better option for budget-conscious buyers, as it holds a 65% advantage in MSRP. Selecting between these two processors depends entirely on whether your priority is maximizing technical performance through superior cache capacity or minimizing your initial expenditure based on the provided pricing data.