The Intel Core Ultra 5 225 is the objective winner of this comparison, securing victory in nine out of fifteen measured specifications. While the Intel Core i5-12400 maintains a notable lead in thread count, offering a 20% advantage in that specific area, the newer model dominates in memory architecture. The most impactful technical advantage for the Intel Core Ultra 5 225 is its L2 cache capacity, which outperforms the older processor by 193%.

Users prioritizing raw thread density for multitasking workloads should select the Intel Core i5-12400 to leverage its 20% advantage in that category. Conversely, those who require the superior L2 cache performance provided by the Intel Core Ultra 5 225 should opt for the newer hardware. By focusing on these specific architectural differences, buyers can align their choice with either the higher thread count of the former or the significantly expanded cache capacity of the latter.