Opteron 2222 SE 's Advantages
Higher base frequency (3GHz vs 1.866GHz)
Xeon L7555 's Advantages
Released 2 years and 11 months late
Higher specification of memory (1333 vs 2)
Newer PCIe version (2 vs 1)
More modern manufacturing process (45nm vs 90nm)
Lower TDP (95W vs 119W)