Opteron 8347 HE 's Advantages
Lower TDP (68W vs 105W)
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)