Intel Xeon D 1531 's Advantages
Released 5 years and 8 months late
Newer PCIe version (3 vs 2)
Higher base frequency (2.2GHz vs 1.866GHz)
More modern manufacturing process (14nm vs 45nm)
Lower TDP (35W vs 105W)
Xeon E7530 's Advantages
Higher specification of memory (1333 vs 4)
Larger L3 cache size (12MB vs 1.5MB)