Intel Xeon E5 1680 v2 's Advantages
Higher base frequency (3GHz vs 2.8GHz)
Lower TDP (130W vs 165W)
Intel Xeon E7 8891 v3 's Advantages
Released 1 years and 9 months late
Higher specification of memory (1866 vs 1866)
Larger L3 cache size (45MB vs 25MB)