Opteron 1389 's Advantages
Higher base frequency (2.9GHz vs 2.2GHz)
Lower TDP (115W vs 250W)
Xeon 6731E 's Advantages
Released 15 years late
Higher specification of memory (5600 vs 1333)
Newer PCIe version (5 vs 2)
Larger L3 cache size (96MB vs 6MB)
More modern manufacturing process (5nm vs 45nm)