AMD Ryzen 7 6800U 's Advantages
Higher specification of memory (6400 vs 5600)
Lower TDP (28W vs 54W)
AMD Ryzen 9 8940H 's Advantages
Released 2 years late
Better graphics card performance
Larger memory bandwidth (89.6GB/s vs 76.8GB/s)
Higher base frequency (4.0GHz vs 2.7GHz)
More modern manufacturing process (4nm vs 6nm)