Xeon E5530 's Advantages
Higher specification of memory (1066 vs 3)
Higher base frequency (2.4GHz vs 2.2GHz)
Larger L3 cache size (8MB vs 3MB)
Intel Xeon E3 1220L 's Advantages
Released 2 years and 1 months late
Newer PCIe version (3 vs 2)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (20W vs 80W)