Xeon E5530 's Advantages
Released 2 years and 1 months late
Higher specification of memory (1066 vs 667)
Newer PCIe version (2 vs 1)
More modern manufacturing process (45nm vs 90nm)
Lower TDP (80W vs 95W)
Opteron 8220 's Advantages
Higher base frequency (2.8GHz vs 2.4GHz)