Intel Xeon E5 2689 's Advantages
Higher specification of memory (1600 vs 3)
Higher base frequency (2.6GHz vs 2.5GHz)
Larger L3 cache size (20MB vs 10MB)
Intel Xeon E5 2609 v2 's Advantages
Released 1 years and 6 months late
More modern manufacturing process (22nm vs 32nm)
Lower TDP (80W vs 115W)