Intel Xeon E5 1620 's Advantages
Released 2 years late
Newer PCIe version (3 vs 2)
Higher base frequency (3.6GHz vs 1.866GHz)
More modern manufacturing process (32nm vs 45nm)
Xeon E7530 's Advantages
Higher specification of memory (1333 vs 3)
Larger L3 cache size (12MB vs 10MB)
Lower TDP (105W vs 130W)