Intel Xeon E5 2650 's Advantages
Released 3 years and 6 months late
Higher specification of memory (DDR3 vs DDR2)
Newer PCIe version (3 vs 2)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (95W vs 150W)
Intel Xeon X5492 's Advantages
Higher base frequency (3.4GHz vs 2GHz)