Intel Xeon E5 2689 's Advantages
Larger L3 cache size (20MB vs 10MB)
Lower TDP (115W vs 130W)
Intel Xeon E5 1620 v2 's Advantages
Released 1 years and 6 months late
Higher specification of memory (DDR3-1866 vs DDR3-1600)
Higher base frequency (3.7GHz vs 2.6GHz)
More modern manufacturing process (22nm vs 32nm)