Intel Xeon D 1531 's Advantages
Released 2 years and 5 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (35W vs 84W)
Intel Xeon E3 1285 v3 's Advantages
Higher base frequency (3.6GHz vs 2.2GHz)
Larger L3 cache size (8MB vs 1.5MB)