Intel Xeon X5492 's Advantages
Higher base frequency (3.4GHz vs 1.6GHz)
Intel Xeon E5 2603 v3 's Advantages
Released 6 years late
Higher specification of memory (1600 vs 3)
Newer PCIe version (3 vs 2)
More modern manufacturing process (22nm vs 45nm)
Lower TDP (85W vs 150W)