Intel Core i7 12800HX 's Advantages
Newer PCIe version (5.0 vs 4.0)
Higher base frequency (2.0GHz vs 1.7GHz)
Larger L3 cache size (25MB vs 12MB)
Intel Core Ultra 7 155U 's Advantages
Released 1 years and 7 months late
Better graphics card performance
Higher specification of memory (LPDDR5-7467 vs DDR5-4800)
Larger memory bandwidth (120GB/s vs 76.8GB/s)
More modern manufacturing process (7nm vs 10nm)
Lower TDP (12W vs 45W)