Intel Xeon E5 2670 's Advantages
Released 3 years late
Newer PCIe version (3 vs 2)
Higher base frequency (2.6GHz vs 2.4GHz)
Larger L3 cache size (20MB vs 8MB)
More modern manufacturing process (32nm vs 45nm)
Xeon E5530 's Advantages
Higher specification of memory (1066 vs 3)
Lower TDP (80W vs 115W)