Opteron 1381 's Advantages
Higher base frequency (2.5GHz vs 1.8GHz)
Intel Xeon E5 2675 v3 's Advantages
Released 5 years and 3 months late
Higher specification of memory (2133 vs 1333)
Newer PCIe version (3 vs 2)
Larger L3 cache size (40MB vs 6MB)
More modern manufacturing process (22nm vs 45nm)
Lower TDP (110W vs 115W)