Opteron 6276 's Advantages
Lower TDP (115W vs 360W)
AMD EPYC 9555P 's Advantages
Released 12 years and 11 months late
Higher specification of memory (6000 vs 3)
Newer PCIe version (5 vs 2)
Higher base frequency (3.2GHz vs 2.3GHz)
Larger L3 cache size (256MB vs 8MB)
More modern manufacturing process (4nm vs 32nm)