Intel Xeon E5 2407 v2 's Advantages
Released 1 years and 6 months late
More modern manufacturing process (22nm vs 32nm)
Lower TDP (80W vs 115W)
Intel Xeon E5 2670 's Advantages
Higher base frequency (2.6GHz vs 2.4GHz)
Larger L3 cache size (20MB vs 10MB)