Intel Core i5 6500 's Advantages
Lower TDP (65W vs 125W)
Intel Core i9 12900K 's Advantages
Released 6 years and 1 months late
Higher specification of memory (4800 vs 2133)
Larger memory bandwidth (76.8GB/s vs 34.1GB/s)
Newer PCIe version (5.0 vs 3.0)
Higher base frequency (32GHz vs 3.2GHz)
Larger L3 cache size (30MB vs 6MB)
More modern manufacturing process (10nm vs 14nm)