Intel Xeon E5 2680 v3 's Advantages
Released 3 years and 7 months late
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)
Intel Xeon E5603 's Advantages
Higher specification of memory (DDR3 vs DDR3)
Lower TDP (80W vs 120W)