Xeon EC5509 's Advantages
Lower TDP (85W vs 115W)
Intel Xeon E5 2689 's Advantages
Released 2 years and 1 months late
Higher specification of memory (1600 vs 1066)
Newer PCIe version (3 vs 2)
Higher base frequency (2.6GHz vs 2GHz)
Larger L3 cache size (20MB vs 8MB)
More modern manufacturing process (32nm vs 45nm)