Intel Xeon E5 1603 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (1866 vs 3)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (140W vs 150W)
Intel Xeon E5 2687W 's Advantages
Higher base frequency (3.1GHz vs 2.8GHz)
Larger L3 cache size (20MB vs 10MB)