Intel Xeon E5 2403 v2 's Advantages
Released 3 years and 6 months late
More modern manufacturing process (22nm vs 45nm)
Lower TDP (80W vs 95W)
Xeon E7520 's Advantages
Higher specification of memory (1333 vs 3)
Higher base frequency (1.866GHz vs 1.8GHz)
Larger L3 cache size (18MB vs 10MB)