Intel Xeon E5 1681 v3 's Advantages
Released 6 years late
Higher specification of memory (2133 vs 3)
Newer PCIe version (3 vs 2)
More modern manufacturing process (22nm vs 45nm)
Lower TDP (135W vs 150W)
Intel Xeon X5492 's Advantages
Higher base frequency (3.4GHz vs 2.9GHz)