Xeon EC5509 's Advantages
Higher specification of memory (1066 vs 3)
Intel Xeon E3 1220 's Advantages
Released 1 years and 2 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.1GHz vs 2GHz)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (80W vs 85W)