Intel Xeon E5 2689 's Advantages
Higher specification of memory (DDR3-1600 vs DDR3)
Larger L3 cache size (20MB vs 8MB)
Intel Xeon E3 1585 v5 's Advantages
Released 4 years and 2 months late
Higher base frequency (3.5GHz vs 2.6GHz)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (65W vs 115W)