Intel Core i7 8665U's Advantages
Lower TDP (15W vs 35W)
AMD Ryzen 7 7840HS's Advantages
Released 3 years and 9 months late
Better graphics card performance
Higher specification of memory (LPDDR5x-7500 vs DDR4-2400)
Larger memory bandwidth (89.6GB/s vs 37.5GB/s)
Newer PCIe version (4.0 vs 3.0)
Higher base frequency (3.8GHz vs 1.9GHz)
Larger L3 cache size (16MB vs 8MB)