Intel Xeon E5 2670 's Advantages
Higher base frequency (2.6GHz vs 2.5GHz)
Larger L3 cache size (20MB vs 19.25MB)
Lower TDP (115W vs 140W)
Intel Xeon W 2175 's Advantages
Released 5 years and 7 months late
Higher specification of memory (2666 vs 3)
More modern manufacturing process (14nm vs 32nm)