Intel Xeon E3 1220 v5 's Advantages
Released 3 years and 5 months late
Higher specification of memory (2133 vs 3)
More modern manufacturing process (14nm vs 22nm)
Intel Xeon E3 1275 v2 's Advantages
Higher base frequency (3.5GHz vs 3GHz)
Lower TDP (77W vs 80W)