Intel Xeon E5649 's Advantages
Lower TDP (80W vs 255W)
Intel Xeon W 3175X 's Advantages
Released 7 years and 11 months late
Higher specification of memory (DDR4-2666 vs DDR3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.1GHz vs 2.533GHz)
Larger L3 cache size (38.5MB vs 12MB)
More modern manufacturing process (14nm vs 32nm)