The Intel Core i7-12700KF wins in 10 out of 14 comparable specs, with 1 tie. Its biggest advantage is L2 Cache (700% better).
Core i5-8400 wins in 3 specs (Max Turbo Power: 66% better).
Recommendation
Choose Core i7-12700KF if you want the best overall performance — especially l2 cache.
Choose Core i5-8400 if max turbo power matters more to you.
