AMD Ryzen 7 7840H 's Advantages
Better graphics card performance
Higher specification of memory (DDR5-5600 vs DDR5-5200)
Larger memory bandwidth (89.6GB/s vs 83.2GB/s)
Higher base frequency (3.8GHz vs 2.5GHz)
Lower TDP (35W vs 55W)
AMD Ryzen 9 7945HX 's Advantages
Newer PCIe version (5.0 vs 4)
Larger L3 cache size (64MB vs 16MB)