Opteron 8222 's Advantages
Higher base frequency (3GHz vs 1.733GHz)
Lower TDP (95W vs 105W)
Xeon E6510 's Advantages
Released 2 years and 7 months late
Higher specification of memory (1333 vs 667)
Newer PCIe version (2 vs 1)
More modern manufacturing process (45nm vs 90nm)