Intel Xeon E5 2689 's Advantages
Larger L3 cache size (20MB vs 10MB)
Lower TDP (115W vs 140W)
Intel Xeon E5 1603 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (1866 vs 1600)
Higher base frequency (2.8GHz vs 2.6GHz)
More modern manufacturing process (22nm vs 32nm)