Intel Xeon E7 4850 v3 's Advantages
Higher specification of memory (1866 vs 4)
Higher base frequency (2.2GHz vs 1.8GHz)
Larger L3 cache size (35MB vs 1.5MB)
Intel Xeon D 1581 's Advantages
Released 8 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (65W vs 115W)