Intel Xeon E3 1220 v3 's Advantages
Released 2 years and 2 months late
Higher specification of memory (1600 vs 1333)
Higher base frequency (3.1GHz vs 2GHz)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (80W vs 105W)
Xeon E7 2820 's Advantages
Larger L3 cache size (18MB vs 8MB)