Intel Xeon E5 2689 's Advantages
Lower TDP (115W vs 135W)
Intel Xeon E5 2643 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (2133 vs 1600)
Higher base frequency (3.4GHz vs 2.6GHz)
More modern manufacturing process (22nm vs 32nm)