The Intel Core i9-12900K is the objective winner of this comparison, securing victory across nine of the fourteen measured specifications. Its most significant technical advantage is its L2 Cache, which is 600% larger than that of the Intel Core i7-9700K. This substantial increase in cache capacity provides the primary performance edge for the newer processor, establishing it as the superior option based on the provided hardware metrics.

Users prioritizing raw cache capacity for complex workloads should select the Intel Core i9-12900K. Conversely, the Intel Core i7-9700K remains a relevant choice for those who specifically require the advantage of its Max Turbo Power, which is 61% better than the alternative. Your final decision should depend on whether your specific computing needs are better served by the massive cache improvements of the newer model or the power profile of the older unit.