Intel Xeon E5620 's Advantages
Higher base frequency (2.4GHz vs 2.1GHz)
Lower TDP (80W vs 120W)
AMD EPYC 7251 's Advantages
Released 7 years and 3 months late
Higher specification of memory (2400 vs 3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (32MB vs 12MB)
More modern manufacturing process (14nm vs 32nm)