Intel Core i7 8557U 's Advantages
Better graphics card performance
Newer PCIe version (3.0 vs 2.0)
Higher base frequency (1.7GHz vs 1.1GHz)
Intel Celeron N4120 's Advantages
Higher specification of memory (2400 vs 2400)
Larger memory bandwidth (38.4GB/s vs 37.5GB/s)
Lower TDP (6W vs 15W)