Intel Xeon E5603 's Advantages
Lower TDP (80W vs 120W)
Intel Xeon E5 2678 v3 's Advantages
Released 3 years and 11 months late
Higher specification of memory (DDR3 vs DDR3)
Newer PCIe version (3 vs 2)
Higher base frequency (2.5GHz vs 1.6GHz)
Larger L3 cache size (30MB vs 4MB)
More modern manufacturing process (22nm vs 32nm)