Intel Core i9 12900HX 's Advantages
Newer PCIe version (5.0 vs 4.0)
Larger L3 cache size (30MB vs 18MB)
Intel Core i5 12600H 's Advantages
Better graphics card performance
Higher specification of memory (LPDDR5-5200 vs DDR5-4800)
Higher base frequency (2.7GHz vs 2.3GHz)
Lower TDP (35W vs 45W)