Intel Xeon E5 4660 v3 's Advantages
Released 5 years and 4 months late
Higher specification of memory (2133 vs 1066)
Newer PCIe version (3 vs 2)
Higher base frequency (2.1GHz vs 2GHz)
Larger L3 cache size (35MB vs 8MB)
More modern manufacturing process (22nm vs 45nm)
Xeon EC5509 's Advantages
Lower TDP (85W vs 120W)