Intel Xeon E5 1691 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 (35MB vs 6MB)
More modern manufacturing process (22nm vs 45nm)
Opteron 1389 's Advantages
Higher base frequency (2.9GHz vs 2.5GHz)
Lower TDP (115W vs 135W)