Intel Core i5 6600 's Advantages
Lower TDP (65W vs 127W)
Intel Core i9 9900KS 's Advantages
Released 4 years and 1 months late
Higher specification of memory (DDR4-2666 vs DDR4-2133)
Larger memory bandwidth (41.6GB/s vs 34.1GB/s)
Higher base frequency (4.0GHz vs 3.3GHz)
Larger L3 cache size (16MB vs 6MB)