Xeon 6979P 's Advantages
Released 9 years and 3 months late
Higher specification of memory (8800 vs 1866)
Newer PCIe version (5 vs 3)
Higher base frequency (2.1GHz vs 1.9GHz)
Larger L3 cache size (504MB vs 25MB)
More modern manufacturing process (5nm vs 22nm)
Intel Xeon E7 4820 v3 's Advantages
Lower TDP (115W vs 500W)