Intel Xeon E3 1220 v2 's Advantages
Newer PCIe version (3 vs 2)
Higher base frequency (3.1GHz vs 2.4GHz)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (69W vs 115W)
Opteron 6378 's Advantages
Released 6 months late
Higher specification of memory (1866 vs 3)