The Intel Core i9-12900K is the objective winner of this comparison, securing more total spec victories across the evaluated categories. Its most significant technical advantage is the inclusion of E-Cores, which provide a 100% increase over the Intel Core i5-12600K. This substantial lead in core architecture distinguishes the higher-tier processor as the more robust option for handling complex, multi-threaded workloads that benefit from additional processing units.

Users prioritizing maximum core count and multi-tasking capacity should select the Intel Core i9-12900K to leverage its superior E-Core configuration. Conversely, the Intel Core i5-12600K is the better choice for budget-conscious builders, as it offers a 51% advantage in MSRP. By choosing the latter, buyers can allocate their resources more efficiently while still obtaining a capable processor that holds its own across several tied performance metrics.