Intel Xeon E5 1660 v2 's Advantages
Higher base frequency (3.7GHz vs 2.3GHz)
Lower TDP (130W vs 140W)
Intel Xeon W 2191B 's Advantages
Released 4 years and 3 months late
Higher specification of memory (2666 vs 1866)
Larger L3 cache size (24.75MB vs 15MB)
More modern manufacturing process (14nm vs 22nm)