Intel Xeon E5 2687W 's Advantages
Higher base frequency (3.1GHz vs 2.8GHz)
Lower TDP (150W vs 165W)
Intel Xeon E7 8891 v3 's Advantages
Released 3 years and 3 months late
Higher specification of memory (1866 vs 3)
Larger L3 cache size (45MB vs 20MB)
More modern manufacturing process (22nm vs 32nm)