Intel Xeon E5 2603 's Advantages
Lower TDP (80W vs 105W)
Intel Xeon E5 2658A v3 's Advantages
Released 2 years and 10 months late
Higher specification of memory (2133 vs 3)
Higher base frequency (2.2GHz vs 1.8GHz)
Larger L3 cache size (30MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)