Intel Core i7 1250U 's Advantages
Released 2 years and 10 months late
Better graphics card performance
Higher specification of memory (5200 vs 2666)
Larger memory bandwidth (76.8GB/s vs 41.8GB/s)
Newer PCIe version (4.0 vs 3.0)
Larger L3 cache size (12MB vs 8MB)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (9W vs 45W)
Intel Core i5 9400H 's Advantages
Higher base frequency (2.5GHz vs 1.1GHz)