Xeon E7 2850 's Advantages
Higher specification of memory (1333 vs 4)
Larger L3 cache size (24MB vs 1.5MB)
Intel Xeon D 1531 's Advantages
Released 4 years and 7 months late
Higher base frequency (2.2GHz vs 2GHz)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (35W vs 130W)