Xeon E7 8870 's Advantages
Larger L3 cache size (30MB vs 19.25MB)
Lower TDP (130W 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 2.4GHz)
More modern manufacturing process (14nm vs 32nm)