Opteron 2214 HE (F2) 's Advantages
Higher base frequency (2.2GHz vs 1.866GHz)
Lower TDP (68W vs 95W)
Xeon E7520 's Advantages
Released 3 years and 7 months late
Higher specification of memory (1333 vs 2)
Newer PCIe version (2 vs 1)
More modern manufacturing process (45nm vs 90nm)