The Intel Core Ultra 5 250K Plus is the objective winner of this comparison, securing victories in eleven out of fourteen measured specifications. While the Intel Core i5-6600K holds a 43% advantage in Max Turbo Power, the newer processor dominates in memory architecture. The most significant technical improvement offered by the Intel Core Ultra 5 250K Plus is its L2 Cache, which provides a 2900% increase over the older model, representing the most impactful performance gain between the two.

Users prioritizing modern architectural efficiency and significantly expanded cache capacity should choose the Intel Core Ultra 5 250K Plus for their build. Conversely, the Intel Core i5-6600K remains a viable option for specific legacy configurations that benefit from its higher Max Turbo Power rating. Selecting between these two components depends entirely on whether your workload requires the massive L2 Cache advantage of the newer architecture or the specific power profile of the older processor.