Intel Xeon E5 2666 v3 's Advantages
Released 5 years and 7 months late
Higher specification of memory (2133 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (2.9GHz vs 2GHz)
Larger L3 cache size (25MB vs 6MB)
More modern manufacturing process (22nm vs 45nm)
Opteron 13KS EE 's Advantages
Lower TDP (50W vs 135W)