Intel Core i5 11400F 's Advantages
Higher base frequency (2.6GHz vs 2.4GHz)
Intel Core i9 12900 's Advantages
Released 10 months late
Higher specification of memory (4800 vs 3200)
Larger memory bandwidth (76.8GB/s vs 50GB/s)
Newer PCIe version (5 vs 4.0)
Larger L3 cache size (30MB vs 12MB)
More modern manufacturing process (10nm vs 14nm)