Intel Xeon E5 2640 v3 's Advantages
Higher base frequency (2.6GHz vs 2.3GHz)
Lower TDP (90W vs 140W)
Intel Xeon W 2191B 's Advantages
Released 3 years and 3 months late
Higher specification of memory (2666 vs 1866)
Larger L3 cache size (24.75MB vs 20MB)
More modern manufacturing process (14nm vs 22nm)