Intel Xeon D 1581 's Advantages
Released 1 years and 5 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (65W vs 135W)
Intel Xeon E5 2643 v3 's Advantages
Higher specification of memory (2133 vs 4)
Higher base frequency (3.4GHz vs 1.8GHz)
Larger L3 cache size (20MB vs 1.5MB)