Xeon E7 2820 's Advantages
Lower TDP (105W vs 140W)
Intel Xeon W 2195 's Advantages
Released 6 years and 4 months late
Higher specification of memory (2666 vs 1333)
Higher base frequency (2.3GHz vs 2GHz)
Larger L3 cache size (24.75MB vs 18MB)
More modern manufacturing process (14nm vs 32nm)