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)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon X5660 's Advantages
Larger L3 cache size (12MB vs 10MB)
Lower TDP (95W vs 140W)