Opteron 13KS EE 's Advantages
Higher specification of memory (1333 vs 4)
Higher base frequency (2GHz vs 1.8GHz)
Larger L3 cache size (6MB vs 1.5MB)
Lower TDP (50W vs 65W)
Intel Xeon D 1581 's Advantages
Released 6 years and 10 months late
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 45nm)