The Intel Core i7-14700F wins in 9 out of 14 comparable specs, with 2 ties. Its biggest advantage is L2 Cache (1767% better).
Core i5-8400 wins in 3 specs (Max Turbo Power: 70% better).
Recommendation
Choose Core i7-14700F if you want the best overall performance — especially l2 cache.
Choose Core i5-8400 if max turbo power matters more to you.
