Intel Xeon E5 2689 's Advantages
Higher base frequency (2.6GHz vs 1.6GHz)
Larger L3 cache size (20MB vs 15MB)
Intel Xeon E5 2603 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (1600 vs 1600)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (85W vs 115W)