Opteron 1381 's Advantages
Lower TDP (115W vs 120W)
Intel Xeon W 2140B 's Advantages
Released 8 years and 6 months late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (3.2GHz vs 2.5GHz)
Larger L3 cache size (11MB vs 6MB)
More modern manufacturing process (14nm vs 45nm)