Intel Core i3 8100 's Advantages
Higher base frequency (3.6GHz vs 3.5GHz)
Lower TDP (65W vs 125W)
Intel Core i9 11900K 's Advantages
Released 3 years and 5 months late
Better graphics card performance
Higher specification of memory (3200 vs 2400)
Larger memory bandwidth (50GB/s vs 37.5GB/s)
Newer PCIe version (4.0 vs 3.0)
Larger L3 cache size (16MB vs 6MB)