Intel Core i5 11600 's Advantages
Better graphics card performance
Higher base frequency (2.8GHz vs 2.5GHz)
Intel Core i5 12400 '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 (5.0 vs 4.0)
Larger L3 cache size (18MB vs 12MB)
More modern manufacturing process (10nm vs 14nm)