Intel Core i9 9900K 's Advantages
Better graphics card performance
Higher base frequency (3.6GHz vs 2.6GHz)
Larger L3 cache size (16MB vs 12MB)
Intel Core i5 11400 's Advantages
Released 2 years and 5 months late
Higher specification of memory (3200 vs 2666)
Larger memory bandwidth (50GB/s vs 41.6GB/s)
Newer PCIe version (4.0 vs 3.0)
Lower TDP (65W vs 95W)