Intel Core i5 6400 's Advantages
Integrated graphics card
Lower TDP (65W vs 165W)
Intel Core i9 7960X 's Advantages
Released 2 years late
Higher specification of memory (2666 vs 2133)
Larger memory bandwidth (79.47GB/s vs 34.1GB/s)
Higher base frequency (2.8GHz vs 2.7GHz)
Larger L3 cache size (22MB vs 6MB)