AMD EPYC 7663 's Advantages
Released 3 years and 9 months late
Higher specification of memory (3200 vs 2666)
Newer PCIe version (4 vs 3)
Larger L3 cache size (256MB vs 64MB)
More modern manufacturing process (7nm vs 14nm)
AMD EPYC 7401 's Advantages
Lower TDP (170W vs 240W)