Intel Core i5 7400 's Advantages
Better graphics card performance
Intel Core i5 8600 's Advantages
Released 1 years and 3 months late
Higher specification of memory (DDR4-2666 vs DDR4-2400)
Larger memory bandwidth (41.6GB/s vs 35.76GB/s)
Higher base frequency (3.1GHz vs 3.0GHz)
Larger L3 cache size (9MB vs 6MB)