AMD Ryzen 7 7840U 's Advantages
Integrated graphics card
Higher specification of memory (LPDDR5x-7500 vs DDR5-5600)
Higher base frequency (3.3GHz vs 3.2GHz)
Lower TDP (15W vs 28W)
AMD Ryzen 5 7545U 's Advantages
Released 6 months late
Newer PCIe version (4 vs 4.0)