Intel Xeon E5 1620 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (2133 vs 1600)
Higher base frequency (3.5GHz vs 2.6GHz)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 2689 's Advantages
Larger L3 cache size (20MB vs 10MB)
Lower TDP (115W vs 140W)