Intel Xeon E5 2420 's Advantages
Higher base frequency (1.9GHz vs 1.8GHz)
Larger L3 cache size (15MB vs 10MB)
Intel Xeon E5 2403 v2 's Advantages
Released 1 years and 4 months late
More modern manufacturing process (22nm vs 32nm)
Lower TDP (80W vs 95W)