The Intel Core Ultra 5 225 is the objective winner of this comparison, securing victory in eight out of fifteen measured specifications. While the Intel Core i9-12900K maintains a significant lead in multi-threaded performance, offering 140% more threads, the Intel Core Ultra 5 225 provides the most impactful advantage by supporting 100% more maximum memory. This superior memory capacity makes the newer processor the more versatile choice for modern system configurations requiring extensive RAM overhead.

Users prioritizing heavy multi-threaded workloads should select the Intel Core i9-12900K to leverage its superior thread count. Conversely, those building systems that demand high memory capacity for professional tasks or future-proofing should choose the Intel Core Ultra 5 225. By focusing on either the raw thread advantage of the former or the expanded memory ceiling of the latter, buyers can align their hardware selection with their specific computing requirements.