Opteron 1381 's Advantages
Higher base frequency (2.5GHz vs 2.3GHz)
Lower TDP (115W vs 140W)
Intel Xeon W 2195 's Advantages
Released 8 years and 2 months late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Larger L3 cache size (24.75MB vs 6MB)
More modern manufacturing process (14nm vs 45nm)