Opteron 13KS EE 's Advantages
Higher specification of memory (1333 vs 3)
Lower TDP (50W vs 95W)
Intel Xeon E5 2640 's Advantages
Released 2 years and 11 months late
Newer PCIe version (3 vs 2)
Higher base frequency (2.5GHz vs 2GHz)
Larger L3 cache size (15MB vs 6MB)
More modern manufacturing process (32nm vs 45nm)