Intel Xeon E5 1603 v3 's Advantages
Released 4 years and 6 months late
Higher specification of memory (1866 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (2.8GHz vs 2.666GHz)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5640 's Advantages
Larger L3 cache size (12MB vs 10MB)
Lower TDP (80W vs 140W)