Intel Xeon E5 1620 's Advantages
Higher base frequency (3.6GHz vs 2.1GHz)
Lower TDP (130W vs 140W)
Intel Xeon E7 8870 v3 's Advantages
Released 3 years and 3 months late
Higher specification of memory (1866 vs 3)
Larger L3 cache size (45MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)