Intel Core i9 12900HX 's Advantages
Newer PCIe version (5.0 vs 4.0)
Higher base frequency (2.3GHz vs 2GHz)
Larger L3 cache size (30MB vs 12MB)
Intel Core i5 12450H 's Advantages
Better graphics card performance
Higher specification of memory (5200 vs 4800)
Lower TDP (45W vs 55W)