Intel Xeon E5 2620 v3 's Advantages
Released 3 years and 5 months late
Higher specification of memory (1866 vs 3)
Larger L3 cache size (15MB vs 8MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E3 1220 's Advantages
Higher base frequency (3.1GHz vs 2.4GHz)
Lower TDP (80W vs 85W)