Intel Xeon E5 2620 's Advantages
Lower TDP (95W vs 210W)
Xeon 6520P 's Advantages
Released 12 years and 11 months late
Higher specification of memory (6400 vs 3)
Newer PCIe version (5 vs 3)
Higher base frequency (2.4GHz vs 2GHz)
Larger L3 cache size (144MB vs 15MB)
More modern manufacturing process (5nm vs 32nm)