Xeon E7 2820 's Advantages
Lower TDP (105W vs 140W)
Intel Xeon W 2175 's Advantages
Released 6 years and 6 months late
Higher specification of memory (2666 vs 1333)
Higher base frequency (2.5GHz vs 2GHz)
Larger L3 cache size (19.25MB vs 18MB)
More modern manufacturing process (14nm vs 32nm)