The AMD Ryzen 9 7900X is the objective winner of this comparison, securing victory in ten out of fourteen measured specifications. Its most significant technical advantage is its L3 cache, which is 300% larger than that of the alternative. While the AMD Ryzen 5 5500 maintains a lead in three categories, the superior cache capacity of the 7900X represents the most substantial performance-related difference between these two processors.

Choose the AMD Ryzen 9 7900X if your primary requirement is the maximum cache capacity available in this comparison. Conversely, the AMD Ryzen 5 5500 is the logical selection for users prioritizing the MSRP, where it holds a 71% advantage over the 7900X. Your final decision should depend on whether you value the significant cache increase offered by the 7900X or the substantial MSRP savings provided by the 5500.