Xeon E7 2820 's Advantages
Larger L3 cache size (18MB vs 10MB)
Lower TDP (105W vs 140W)
Intel Xeon E5 1607 v3 's Advantages
Released 3 years and 5 months late
Higher specification of memory (1866 vs 1333)
Higher base frequency (3.1GHz vs 2GHz)
More modern manufacturing process (22nm vs 32nm)