Intel Xeon E5 2658 v3 's Advantages
Released 4 years and 6 months late
Higher specification of memory (2133 vs 3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (30MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5620 's Advantages
Higher base frequency (2.4GHz vs 2.2GHz)
Lower TDP (80W vs 105W)