Intel Core i7 7800X 's Advantages
Larger memory bandwidth (79.47GB/s vs 76.8GB/s)
Intel Core i9 12900K 's Advantages
Released 4 years and 5 months late
Integrated graphics card
Higher specification of memory (DDR5-4800 vs DDR4-2400)
Newer PCIe version (5.0 vs 3.0)
Higher base frequency (32GHz vs 3.5GHz)
Larger L3 cache size (30MB vs 8MB)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (125W vs 140W)