Opteron 8347 HE (B3) 's Advantages
Lower TDP (68W vs 95W)
Xeon X3480 's Advantages
Released 2 years late
Higher specification of memory (1333 vs 667)
Higher base frequency (3.066GHz vs 1.9GHz)
Larger L3 cache size (8MB vs 2MB)
More modern manufacturing process (45nm vs 65nm)