Intel Core i5 9400 's Advantages
Higher base frequency (2.9GHz vs 2.8GHz)
Intel Core i9 10900 's Advantages
Released 1 years and 4 months late
Higher specification of memory (2933 vs 2666)
Larger memory bandwidth (45.8GB/s vs 41.6GB/s)
Larger L3 cache size (20MB vs 9MB)