The Intel Core Ultra 5 245K is the objective winner of this comparison, securing victories in nine out of fourteen measured specifications. Its most significant technical advantage over the AMD Ryzen 7 5800X is its L2 cache, which is 550% larger. While the AMD Ryzen 7 5800X maintains a 33% lead in L3 cache capacity, the Intel Core Ultra 5 245K demonstrates superior overall hardware specifications across the majority of the evaluated categories.

Users prioritizing the substantial L2 cache advantage should select the Intel Core Ultra 5 245K for their build. Conversely, the AMD Ryzen 7 5800X remains the appropriate choice for those who specifically require the 33% higher L3 cache capacity provided by that processor. Your final decision should depend on whether your specific workload benefits more from the significantly larger L2 cache of the Intel option or the L3 cache advantage offered by the AMD alternative.