The Intel Core Ultra 7 265K is the objective winner of this comparison, securing victories in eleven out of fourteen evaluated specifications. Its most significant technical advantage is the L2 Cache, which is 1340% better than that of the Intel Core i9-10900K. This substantial improvement in cache capacity represents the primary performance differentiator between the two processors, establishing the newer model as the superior option across the vast majority of the measured technical categories.

Users should choose the Intel Core Ultra 7 265K if they require the latest architectural advancements and the massive L2 Cache advantage provided by the newer platform. Conversely, the Intel Core i9-10900K remains an option only for those who do not require the technical improvements found in the newer generation. Given the clear disparity in spec wins, the newer processor is the recommended choice for anyone prioritizing modern hardware capabilities and increased cache efficiency.