Xeon E5472 's Advantages
Lower TDP (80W vs 130W)
Intel Xeon E5 1620 v2 's Advantages
Released 5 years and 10 months late
Higher specification of memory (1866 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.7GHz vs 3GHz)
More modern manufacturing process (22nm vs 45nm)