Intel Core i9 9900KS 's Advantages
Higher base frequency (4.0GHz vs 3.3GHz)
Larger L3 cache size (16MB vs 12MB)
Intel Core i3 12100 's Advantages
Released 2 years and 3 months late
Better graphics card performance
Higher specification of memory (4800 vs 2666)
Larger memory bandwidth (76.8GB/s vs 41.6GB/s)
Newer PCIe version (5.0 vs 3.0)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (60W vs 127W)