Intel Xeon E5 1691 v3 's Advantages
Lower TDP (135W vs 225W)
Intel Xeon w7 2495X 's Advantages
Released 8 years and 5 months late
Higher specification of memory (4800 vs 2133)
Newer PCIe version (5 vs 3)
Larger L3 cache size (45MB vs 35MB)
More modern manufacturing process (10nm vs 22nm)