Intel Core i5 8279U 's Advantages
Lower TDP (28W vs 35W)
Intel Core i9 12900H 's Advantages
Released 2 years and 8 months late
Better graphics card performance
Higher specification of memory (LPDDR5-5200 vs DDR4-2400)
Larger memory bandwidth (76.8GB/s vs 37.5GB/s)
Newer PCIe version (4.0 vs 3.0)
Higher base frequency (2.5GHz vs 2.4GHz)
Larger L3 cache size (24MB vs 6MB)
More modern manufacturing process (10nm vs 14nm)