Intel Core i7 6500U 's Advantages
Lower TDP (15W vs 45W)
Intel Core i5 9400H 's Advantages
Released 3 years and 7 months late
Higher specification of memory (2666 vs 2133)
Larger memory bandwidth (41.8GB/s vs 34.1GB/s)
Larger L3 cache size (8MB vs 4MB)