Opteron 6168 's Advantages
Lower TDP (115W vs 180W)
AMD EPYC 7551P 's Advantages
Released 7 years and 3 months late
Higher specification of memory (2666 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (2GHz vs 1.9GHz)
Larger L3 cache size (64MB vs 12MB)
More modern manufacturing process (14nm vs 45nm)