Opteron 1389 's Advantages
Higher base frequency (2.9GHz vs 2.8GHz)
Lower TDP (115W vs 140W)
Intel Xeon E5 1603 v3 's Advantages
Released 5 years and 3 months late
Higher specification of memory (1866 vs 1333)
Newer PCIe version (3 vs 2)
Larger L3 cache size (10MB vs 6MB)
More modern manufacturing process (22nm vs 45nm)