Intel Xeon D 1520 's Advantages
Higher base frequency (2.2GHz vs 2.1GHz)
Lower TDP (45W vs 500W)
Xeon 6979P 's Advantages
Released 9 years and 6 months late
Higher specification of memory (8800 vs 4)
Newer PCIe version (5 vs 3)
Larger L3 cache size (504MB vs 1.5MB)
More modern manufacturing process (5nm vs 14nm)