Xeon E5530 's Advantages
Higher base frequency (2.4GHz vs 2GHz)
Lower TDP (80W vs 105W)
Intel Xeon E5 4620 v3 's Advantages
Released 6 years and 3 months late
Higher specification of memory (1866 vs 1066)
Newer PCIe version (3 vs 2)
Larger L3 cache size (25MB vs 8MB)
More modern manufacturing process (22nm vs 45nm)