Xeon E7 2820 's Advantages
Released 3 years and 7 months late
Higher specification of memory (1333 vs 667)
Higher base frequency (2GHz vs 1.9GHz)
Larger L3 cache size (18MB vs 2MB)
More modern manufacturing process (32nm vs 65nm)
Opteron 8347 HE 's Advantages
Lower TDP (68W vs 105W)