Intel Xeon D 1567 's Advantages
Released 8 years and 3 months late
Higher specification of memory (4 vs 3)
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 45nm)
Lower TDP (65W vs 80W)
Xeon E5420 's Advantages
Higher base frequency (2.5GHz vs 2.1GHz)