AMD EPYC 9754 's Advantages
Released 3 years and 10 months late
Higher specification of memory (DDR5-4800 vs DDR4-3200)
Newer PCIe version (5 vs 4)
More modern manufacturing process (5nm vs 7nm)
AMD EPYC 7642 's Advantages
Higher base frequency (2.4GHz vs 2.25GHz)
Lower TDP (225W vs 360W)