Intel Xeon E5 2658A v3 's Advantages
Released 4 years and 11 months late
Higher specification of memory (2133 vs 1066)
Newer PCIe version (3 vs 2)
Higher base frequency (2.2GHz vs 2GHz)
Larger L3 cache size (30MB vs 8MB)
More modern manufacturing process (22nm vs 45nm)
Xeon EC5509 's Advantages
Lower TDP (85W vs 105W)