Intel Xeon E5 2670 v2 's Advantages
Released 3 years and 6 months late
Newer PCIe version (3 vs 2)
Higher base frequency (2.5GHz vs 2.266GHz)
Larger L3 cache size (25MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon L5640 's Advantages
Lower TDP (60W vs 115W)