Intel Xeon D 1557 's Advantages
Released 1 years and 5 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (45W vs 135W)
Intel Xeon E5 1691 v3 's Advantages
Higher specification of memory (2133 vs 4)
Higher base frequency (2.5GHz vs 1.5GHz)
Larger L3 cache size (35MB vs 1.5MB)