Intel Xeon E3 1231 v3 's Advantages
Higher specification of memory (DDR3-1600 vs DDR3)
Higher base frequency (3.4GHz vs 2.5GHz)
Intel Xeon E3 1565L v5 's Advantages
Released 2 years late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (35W vs 80W)