Intel Xeon D 1521 's Advantages
Lower TDP (45W vs 360W)
AMD EPYC 9555 's Advantages
Released 8 years and 11 months late
Higher specification of memory (6000 vs 4)
Newer PCIe version (5 vs 3)
Higher base frequency (3.2GHz vs 2.4GHz)
Larger L3 cache size (256MB vs 1.5MB)
More modern manufacturing process (4nm vs 14nm)