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