Intel Xeon E5 2689 's Advantages
Higher base frequency (2.6GHz vs 2GHz)
Lower TDP (115W vs 120W)
Intel Xeon E5 2683 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (2133 vs 1600)
Larger L3 cache size (35MB vs 20MB)
More modern manufacturing process (22nm vs 32nm)