Intel Xeon E5 2637 v2 's Advantages
Released 2 years and 5 months late
Higher base frequency (3.5GHz vs 2GHz)
More modern manufacturing process (22nm vs 32nm)
Xeon E7 4820 's Advantages
Higher specification of memory (1333 vs 3)
Larger L3 cache size (18MB vs 10MB)
Lower TDP (105W vs 130W)