Intel Xeon D 1520 's Advantages
Released 7 years and 4 months late
Higher specification of memory (4 vs 3)
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 45nm)
Lower TDP (45W vs 120W)
Xeon X5450 's Advantages
Higher base frequency (3GHz vs 2.2GHz)