Intel Core i9 10900KF 's Advantages
Released 4 years and 8 months late
Higher specification of memory (DDR4-2933 vs DDR4-2133)
Larger memory bandwidth (45.8GB/s vs 34.1GB/s)
Higher base frequency (3.7GHz vs 2.7GHz)
Larger L3 cache size (20MB vs 6MB)
Intel Core i5 6400 's Advantages
Integrated graphics card
Lower TDP (65W vs 125W)