Intel Core i7 7700HQ 's Advantages
Higher base frequency (2.8GHz vs 1.7GHz)
Intel Core i7 8557U 's Advantages
Released 2 years and 6 months late
Better graphics card performance
Higher specification of memory (DDR4-2400 vs DDR4-2400)
Larger L3 cache size (8MB vs 6MB)
Lower TDP (15W vs 45W)