Intel Core i5 11400F 's Advantages
Higher base frequency (2.6GHz vs 2.4GHz)
Intel Core i9 12900F 's Advantages
Released 10 months late
Higher specification of memory (DDR5-4800 vs DDR4-3200)
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)