Intel Core i5 9400F 's Advantages
Released 4 years and 5 months late
Higher specification of memory (DDR4-2666 vs DDR4-2133)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (65W vs 140W)
Intel Core i7 5960X 's Advantages
Larger memory bandwidth (68GB/s vs 41.6GB/s)
Higher base frequency (3.0GHz vs 2.9GHz)
Larger L3 cache size (20MB vs 9MB)