Intel Xeon E5 1620 v3 's Advantages
Released 3 years and 5 months late
Higher specification of memory (2133 vs 1333)
Higher base frequency (3.5GHz vs 2GHz)
More modern manufacturing process (22nm vs 32nm)
Xeon E7 2820 's Advantages
Larger L3 cache size (18MB vs 10MB)
Lower TDP (105W vs 140W)