Intel Xeon E5 2670 v2 's Advantages
Released 1 years and 6 months late
Larger L3 cache size (25MB vs 15MB)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (115W vs 130W)
Intel Xeon E5 1660 's Advantages
Higher base frequency (3.3GHz vs 2.5GHz)