Intel Xeon E3 1225 v2 's Advantages
Released 2 years and 2 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.2GHz vs 2.4GHz)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (77W vs 80W)
Intel Xeon E5645 's Advantages
Larger L3 cache size (12MB vs 8MB)