Intel Xeon E5 2403 v2 's Advantages
Lower TDP (80W vs 215W)
Xeon 6556P B 's Advantages
Released 11 years and 5 months late
Higher specification of memory (6400 vs 3)
Higher base frequency (2.3GHz vs 1.8GHz)
Larger L3 cache size (144MB vs 10MB)
More modern manufacturing process (5nm vs 22nm)