Intel Xeon E5 2403 's Advantages
Lower TDP (80W vs 120W)
Intel Xeon E5 2676 v3 's Advantages
Released 3 years and 1 months late
Higher specification of memory (DDR3 vs DDR3)
Higher base frequency (2.4GHz vs 1.8GHz)
Larger L3 cache size (30MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)