Intel Xeon E5 2649 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 (105W vs 150W)
Intel Xeon X5492 's Advantages
Higher base frequency (3.4GHz vs 2.3GHz)