Opteron 13KS EE 's Advantages
Higher specification of memory (1333 vs 3)
Higher base frequency (2GHz vs 1.6GHz)
Larger L3 cache size (6MB vs 4MB)
Lower TDP (50W vs 80W)
Intel Xeon E5603 's Advantages
Released 1 years and 10 months late
More modern manufacturing process (32nm vs 45nm)