Opteron 4334 's Advantages
Higher base frequency (3.1GHz vs 2.4GHz)
Lower TDP (95W vs 170W)
AMD EPYC 7351 's Advantages
Released 4 years and 6 months late
Higher specification of memory (DDR4-2666 vs DDR3)
Larger L3 cache size (64MB vs 8MB)
More modern manufacturing process (14nm vs 32nm)