AMD Ryzen 7 2700U 's Advantages
Better graphics card performance
Higher base frequency (2.2GHz vs 2.1GHz)
AMD Ryzen 5 3450U 's Advantages
Released 2 years and 3 months late
Larger memory bandwidth (38.4GB/s vs 35.76GB/s)
More modern manufacturing process (12nm vs 14nm)
Lower TDP (12W vs 15W)