AMD EPYC 7551P 's Advantages
Released 7 years and 4 months late
Higher specification of memory (2666 vs 1066)
Newer PCIe version (3 vs 2)
Larger L3 cache size (64MB vs 8MB)
More modern manufacturing process (14nm vs 45nm)
Xeon EC5509 's Advantages
Lower TDP (85W vs 180W)