Xeon EC5509 's Advantages
Higher specification of memory (1066 vs 3)
Intel Xeon E3 1275 v2 's Advantages
Released 2 years and 3 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.5GHz vs 2GHz)
More modern manufacturing process (22nm vs 45nm)
Lower TDP (77W vs 85W)