Intel Xeon E5603 's Advantages
Lower TDP (80W vs 135W)
Intel Xeon E5 2637 v3 's Advantages
Released 3 years and 7 months late
Higher specification of memory (2133 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.5GHz vs 1.6GHz)
Larger L3 cache size (15MB vs 4MB)
More modern manufacturing process (22nm vs 32nm)