AMD Ryzen 3 4300U 's Advantages
Lower TDP (10W vs 35W)
AMD Ryzen 5 7640HS 's Advantages
Released 3 years late
Higher specification of memory (LPDDR5x-7500 vs LPDDR4-4266)
Larger memory bandwidth (89.6GB/s vs 68.27GB/s)
Newer PCIe version (4.0 vs 3.0)
Higher base frequency (4.3GHz vs 2.7GHz)
Larger L3 cache size (16MB vs 4MB)