AMD Ryzen 5 Pro 7540U 's Advantages
Integrated graphics card
Higher specification of memory (7500 vs 5600)
AMD Ryzen 5 PRO 8640U 's Advantages
Released 10 months late
Newer PCIe version (4 vs 4.0)
Higher base frequency (3.5GHz vs 3.2GHz)
Lower TDP (28W vs 30W)