Intel Xeon E5 2407 v2 's Advantages
Released 3 years and 6 months late
Higher base frequency (2.4GHz vs 1.866GHz)
More modern manufacturing process (22nm vs 45nm)
Lower TDP (80W vs 95W)
Xeon E7520 's Advantages
Higher specification of memory (1333 vs 3)
Larger L3 cache size (18MB vs 10MB)