AMD EPYC 7642 's Advantages
Lower TDP (225W vs 280W)
AMD EPYC 9534 's Advantages
Released 3 years and 3 months late
Higher specification of memory (4800 vs 3200)
Newer PCIe version (5 vs 4)
Higher base frequency (2.45GHz vs 2.4GHz)
More modern manufacturing process (5nm vs 7nm)