Intel Xeon E3 1245 v2 's Advantages
Released 2 years and 2 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.4GHz vs 2.4GHz)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (77W vs 80W)
Intel Xeon E5620 's Advantages
Larger L3 cache size (12MB vs 8MB)