Intel Core i5 7640X 's Advantages
Higher specification of memory (DDR4-2666 vs DDR4-2400)
Larger memory bandwidth (42.7GB/s vs 37.5GB/s)
Higher base frequency (4.0GHz vs 3.6GHz)
Intel Core i3 8100 's Advantages
Integrated graphics card
Lower TDP (65W vs 112W)