Xeon E6540 '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)
Opteron 8222 's Advantages
Higher base frequency (3GHz vs 2GHz)
Lower TDP (95W vs 105W)