AMD EPYC 9555 's Advantages
Released 10 months late
Higher specification of memory (6000 vs 4800)
Larger L3 cache size (256MB vs 18MB)
More modern manufacturing process (4nm vs 10nm)
Xeon E 2456 's Advantages
Higher base frequency (3.3GHz vs 3.2GHz)
Lower TDP (80W vs 360W)