Opteron 4334 's Advantages
Higher base frequency (3.1GHz vs 2.1GHz)
Lower TDP (95W vs 120W)
AMD EPYC 7251 's Advantages
Released 4 years and 6 months late
Higher specification of memory (2400 vs 3)
Larger L3 cache size (32MB vs 8MB)
More modern manufacturing process (14nm vs 32nm)