AMD EPYC 7261 's Advantages
Higher base frequency (2.5GHz vs 2.4GHz)
Lower TDP (170W vs 400W)
AMD EPYC 9745 's Advantages
Released 6 years and 4 months late
Higher specification of memory (6000 vs 2666)
Newer PCIe version (5 vs 3)
Larger L3 cache size (256MB vs 32MB)
More modern manufacturing process (3nm vs 14nm)