Intel Xeon E3 1270 's Advantages
Lower TDP (80W vs 140W)
Intel Xeon E5 1620 v3 's Advantages
Released 3 years and 5 months late
Higher specification of memory (2133 vs 3)
Higher base frequency (3.5GHz vs 3.4GHz)
Larger L3 cache size (10MB vs 8MB)
More modern manufacturing process (22nm vs 32nm)