Intel Xeon E5 2603 v3 's Advantages
Released 2 years and 4 months late
Higher specification of memory (1600 vs 3)
Larger L3 cache size (15MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 2403 's Advantages
Higher base frequency (1.8GHz vs 1.6GHz)
Lower TDP (80W vs 85W)