AMD Ryzen 7 8840HS 's Advantages
Better graphics card performance
Higher specification of memory (LPDDR5x-7500 vs DDR5-5200)
Larger memory bandwidth (89.6GB/s vs 83.2GB/s)
Higher base frequency (3.3GHz vs 2.3GHz)
Lower TDP (20W vs 55W)
AMD Ryzen 9 7945HX3D 's Advantages
Newer PCIe version (5 vs 4.0)
Larger L3 cache size (128MB vs 16MB)