Xeon EC5539 's Advantages
Released 2 years and 6 months late
Higher specification of memory (1333 vs 667)
Newer PCIe version (2 vs 1)
More modern manufacturing process (45nm vs 90nm)
Lower TDP (65W vs 95W)
Opteron 8222 's Advantages
Higher base frequency (3GHz vs 2.266GHz)