Intel Xeon E7 8891 v3 's Advantages
Higher base frequency (2.8GHz vs 2.2GHz)
Lower TDP (165W vs 250W)
Xeon 6731E 's Advantages
Released 9 years late
Higher specification of memory (5600 vs 1866)
Newer PCIe version (5 vs 3)
Larger L3 cache size (96MB vs 45MB)
More modern manufacturing process (5nm vs 22nm)