Intel Xeon E5503 's Advantages
Lower TDP (80W vs 120W)
Intel Xeon E5 2678 v3 's Advantages
Released 4 years and 10 months late
Higher specification of memory (2133 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (2.5GHz vs 2GHz)
Larger L3 cache size (30MB vs 4MB)
More modern manufacturing process (22nm vs 45nm)