AMD Ryzen 5 7430U 's Advantages
Lower TDP (15W vs 35W)
AMD Ryzen 7 7840H 's Advantages
Better graphics card performance
Higher specification of memory (5600 vs 4267)
Newer PCIe version (4 vs 3.0)
Higher base frequency (3.8GHz vs 2.3GHz)
More modern manufacturing process (4nm vs 7nm)