Opteron 2222 's Advantages
Higher base frequency (3GHz vs 2.533GHz)
Xeon EC5549 's Advantages
Released 2 years and 6 months late
Higher specification of memory (1333 vs 2)
Newer PCIe version (2 vs 1)
More modern manufacturing process (45nm vs 90nm)
Lower TDP (85W vs 95W)