Opteron 1389 's Advantages
Higher specification of memory (1333 vs 3)
Larger L3 cache size (6MB vs 5MB)
Intel Xeon E5 2637 's Advantages
Released 2 years and 9 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3GHz vs 2.9GHz)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (80W vs 115W)