Intel Core i5 8400 's Advantages
Released 3 years and 9 months late
Integrated graphics card
Higher specification of memory (2666 vs 1600)
Higher base frequency (2.8GHz vs 2.6GHz)
Larger L3 cache size (9MB vs 6MB)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (65W vs 80W)
Pentium 1403 V2 's Advantages
Newer PCIe version (3 vs 3.0)