Intel Xeon W 2104 's Advantages
Released 2 years and 11 months late
Higher specification of memory (2666 vs 2133)
Higher base frequency (3.2GHz vs 2.5GHz)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (120W vs 135W)
Intel Xeon E5 1691 v3 's Advantages
Larger L3 cache size (35MB vs 8.25MB)