The Intel Core Ultra 9 285K is the objective winner of this comparison, securing victory in seven of the fourteen evaluated specifications. While both processors demonstrate distinct architectural strengths, the Intel Core Ultra 9 285K holds the most significant advantage in L2 cache capacity, which is 233% larger than that of its competitor. This technical lead across the majority of measured categories establishes it as the superior option based on the provided hardware specifications.

Users prioritizing raw cache capacity for specific workloads should choose the AMD Ryzen 9 7900X3D, which offers an L3 cache that is 256% larger than the Intel alternative. Conversely, those who favor the broader technical advantages and the significantly higher L2 cache density provided by the Intel Core Ultra 9 285K should select that model. Your final decision should depend on whether your specific computing requirements benefit more from the L3 cache superiority of the AMD Ryzen 9 7900X3D or the L2 cache advantage of the Intel Core Ultra 9 285K.