AMD EPYC 7401 's Advantages
Released 7 years and 3 months late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (2GHz vs 1.866GHz)
Larger L3 cache size (64MB vs 18MB)
More modern manufacturing process (14nm vs 45nm)
Xeon E7520 's Advantages
Lower TDP (95W vs 170W)