Intel Xeon E5640 's Advantages
Released 3 years and 1 months late
Higher specification of memory (3 vs 2)
Newer PCIe version (2 vs 1)
More modern manufacturing process (32nm vs 90nm)
Lower TDP (80W vs 95W)
Opteron 2220 's Advantages
Higher base frequency (2.8GHz vs 2.666GHz)