Intel Xeon E5 2603 's Advantages
Lower TDP (80W vs 85W)
Intel Xeon E5 2609 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (1600 vs 3)
Higher base frequency (1.9GHz vs 1.8GHz)
Larger L3 cache size (15MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)