Intel Core i9 12900HX 's Advantages
Released 2 years and 10 months late
Higher specification of memory (DDR5-4800 vs DDR4-2400)
Larger memory bandwidth (76.8GB/s vs 37.5GB/s)
Newer PCIe version (5.0 vs 3.0)
Higher base frequency (2.3GHz vs 1.7GHz)
Larger L3 cache size (30MB vs 8MB)
More modern manufacturing process (10nm vs 14nm)
Intel Core i7 8557U 's Advantages
Better graphics card performance
Lower TDP (15W vs 45W)