Intel Xeon X5492 's Advantages
Higher base frequency (3.4GHz vs 3.1GHz)
Lower TDP (150W vs 255W)
Intel Xeon W 3175X 's Advantages
Released 10 years and 4 months late
Higher specification of memory (DDR4-2666 vs DDR2)
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 45nm)