Intel Xeon E5 2689 's Advantages
Higher base frequency (2.6GHz vs 2.3GHz)
Intel Xeon E5 2618L v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (1866 vs 1600)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (75W vs 115W)