Intel Core i5 9400 's Advantages
Released 4 years and 8 months late
Integrated graphics card
Higher specification of memory (DDR4-2666 vs DDR3-1600)
Larger L3 cache size (9MB vs 8MB)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (65W vs 80W)
Intel Xeon E3 1231 v3 's Advantages
Newer PCIe version (3 vs 3.0)
Higher base frequency (3.4GHz vs 2.9GHz)