Intel Xeon E5503 's Advantages
Lower TDP (80W vs 130W)
Intel Xeon E5 1607 v2 's Advantages
Released 3 years and 6 months late
Higher specification of memory (1600 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (3GHz vs 2GHz)
Larger L3 cache size (10MB vs 4MB)
More modern manufacturing process (22nm vs 45nm)