Opteron 6278 's Advantages
Higher base frequency (2.4GHz vs 2.1GHz)
Lower TDP (115W vs 500W)
Xeon 6979P 's Advantages
Released 12 years and 4 months late
Higher specification of memory (8800 vs 3)
Newer PCIe version (5 vs 2)
Larger L3 cache size (504MB vs 8MB)
More modern manufacturing process (5nm vs 32nm)