Intel Xeon E5 2660 v2 's Advantages
Released 3 years and 7 months late
Newer PCIe version (3 vs 2)
Higher base frequency (2.2GHz vs 2GHz)
Larger L3 cache size (25MB vs 8MB)
More modern manufacturing process (22nm vs 45nm)
Xeon EC5509 's Advantages
Higher specification of memory (1066 vs 3)
Lower TDP (85W vs 95W)