Intel Xeon E5620 's Advantages
Higher base frequency (2.4GHz vs 2.3GHz)
Lower TDP (80W vs 150W)
Xeon 6511P 's Advantages
Released 14 years and 11 months late
Higher specification of memory (6400 vs 3)
Newer PCIe version (5 vs 2)
Larger L3 cache size (72MB vs 12MB)
More modern manufacturing process (5nm vs 32nm)