Opteron 1381 's Advantages
Lower TDP (115W vs 160W)
Intel Xeon E5 2687W v3 's Advantages
Released 5 years and 3 months late
Higher specification of memory (2133 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (3.1GHz vs 2.5GHz)
Larger L3 cache size (25MB vs 6MB)
More modern manufacturing process (22nm vs 45nm)