The Intel Core i9-12900K wins in 9 out of 14 comparable specs, with 1 tie. Its biggest advantage is L2 Cache (600% better).
Core i9-9900K wins in 4 specs (Max Turbo Power: 61% better).
Recommendation
Choose Core i9-12900K if you want the best overall performance — especially l2 cache.
Choose Core i9-9900K if max turbo power matters more to you.
