Xeon E5540 's Advantages
Released 2 years and 7 months late
Higher specification of memory (1066 vs 667)
Newer PCIe version (2 vs 1)
More modern manufacturing process (45nm vs 90nm)
Lower TDP (80W vs 95W)
Opteron 8218 (F2) 's Advantages
Higher base frequency (2.6GHz vs 2.533GHz)