Intel Core i9 10900X 's Advantages
Higher specification of memory (2933 vs 2666)
Larger memory bandwidth (93.8GB/s vs 41.6GB/s)
Higher base frequency (3.7GHz vs 2.9GHz)
Larger L3 cache size (20MB vs 12MB)
Intel Core i5 10400F 's Advantages
Released 7 months late
Lower TDP (65W vs 165W)