Intel Xeon W 2191B 's Advantages
Released 7 years and 9 months late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (2.3GHz vs 2GHz)
Larger L3 cache size (24.75MB vs 18MB)
More modern manufacturing process (14nm vs 45nm)
Xeon E7540 's Advantages
Lower TDP (105W vs 140W)