Opteron 8222 's Advantages
Higher base frequency (3GHz vs 2GHz)
Xeon EC5509 's Advantages
Released 2 years and 6 months late
Higher specification of memory (1066 vs 667)
Newer PCIe version (2 vs 1)
More modern manufacturing process (45nm vs 90nm)
Lower TDP (85W vs 95W)