Intel Core i5 5200U 's Advantages
Higher base frequency (2.2GHz vs 1.9GHz)
Intel Core i7 8665U 's Advantages
Released 4 years and 3 months late
Higher specification of memory (2400 vs 1600)
Larger memory bandwidth (37.5GB/s vs 25.6GB/s)
Newer PCIe version (3.0 vs 2.0)
Larger L3 cache size (8MB vs 3MB)