Intel Core i5 6600K 's Advantages
Higher base frequency (3.5GHz vs 3.4GHz)
Larger L3 cache size (6MB vs 4MB)
Intel Celeron G6900 's Advantages
Released 6 years and 5 months late
Higher specification of memory (DDR5-4800 vs DDR4-2133)
Larger memory bandwidth (76.8GB/s vs 34.1GB/s)
Newer PCIe version (5.0 vs 3.0)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (46W vs 91W)