Intel Core i7 7740X 's Advantages
Higher specification of memory (2666 vs 2400)
Larger memory bandwidth (42.7GB/s vs 35.76GB/s)
Higher base frequency (4.3GHz vs 3.0GHz)
Larger L3 cache size (8MB vs 6MB)
Intel Core i5 7400 's Advantages
Integrated graphics card
Lower TDP (65W vs 112W)