AMD Ryzen 7 7840HS 's Advantages
Higher specification of memory (7500 vs 6400)
Higher base frequency (3.8GHz vs 2.4GHz)
Lower TDP (54W vs 55W)
Intel Core Ultra 7 255HX 's Advantages
Released 1 years and 9 months late
Larger memory bandwidth (102.4GB/s vs 89.6GB/s)
Newer PCIe version (5 vs 4.0)
Larger L3 cache size (24MB vs 16MB)
More modern manufacturing process (3nm vs 4nm)