Xeon E6540 's Advantages
Lower TDP (105W vs 255W)
Intel Xeon W 3175X 's Advantages
Released 8 years and 10 months late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (3.1GHz vs 2GHz)
Larger L3 cache size (38.5MB vs 18MB)
More modern manufacturing process (14nm vs 45nm)