Intel Xeon E5 2670 's Advantages
Lower TDP (115W vs 135W)
Intel Xeon E5 2667 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Higher base frequency (3.2GHz vs 2.6GHz)
More modern manufacturing process (22nm vs 32nm)