Intel Xeon E7 4820 v3 's Advantages
Larger L3 cache size (25MB vs 13.75MB)
Lower TDP (115W vs 120W)
Intel Xeon W 2150B 's Advantages
Released 2 years and 6 months late
Higher specification of memory (2666 vs 1866)
Higher base frequency (3GHz vs 1.9GHz)
More modern manufacturing process (14nm vs 22nm)