The AMD Ryzen 9 3900X is the objective winner of this comparison, securing victories in nine out of fourteen measured fields. Its most significant technical advantage is the L3 Cache, which is 433% larger than that of the Intel Core i5-11400F. This substantial capacity difference represents the primary performance differentiator between the two processors, establishing the former as the superior option for tasks that rely heavily on high-speed memory access.

Users prioritizing raw technical specifications and memory-intensive workloads should choose the AMD Ryzen 9 3900X to leverage its superior cache architecture. Conversely, the Intel Core i5-11400F is the logical selection for budget-conscious builders, as it holds a 69% advantage in MSRP. By selecting the latter, buyers trade the performance benefits of the larger cache for a significantly lower cost, making it the preferred choice for those focused on initial acquisition value.