Intel Xeon D 1531 's Advantages
Released 2 years and 2 months late
Higher specification of memory (4 vs 3)
Higher base frequency (2.2GHz vs 2GHz)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (35W vs 95W)
Intel Xeon E5 2640 v2 's Advantages
Larger L3 cache size (20MB vs 1.5MB)