Intel Xeon D 1520 's Advantages
Lower TDP (45W vs 210W)
Xeon 6520P 's Advantages
Released 9 years and 11 months late
Higher specification of memory (6400 vs 4)
Newer PCIe version (5 vs 3)
Higher base frequency (2.4GHz vs 2.2GHz)
Larger L3 cache size (144MB vs 1.5MB)
More modern manufacturing process (5nm vs 14nm)