Intel Core i5 8265U 's Advantages
Lower TDP (15W vs 55W)
Intel Core i7 12800HX 's Advantages
Released 3 years and 9 months late
Better graphics card performance
Higher specification of memory (4800 vs 2400)
Larger memory bandwidth (76.8GB/s vs 37.5GB/s)
Newer PCIe version (5.0 vs 3.0)
Higher base frequency (2.0GHz vs 1.6GHz)
Larger L3 cache size (25MB vs 6MB)
More modern manufacturing process (10nm vs 14nm)