Intel Xeon E5 2670 v2 's Advantages
Released 2 years and 7 months late
Newer PCIe version (3 vs 2)
Higher base frequency (2.5GHz vs 1.6GHz)
Larger L3 cache size (25MB vs 4MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5603 's Advantages
Lower TDP (80W vs 115W)