Intel Xeon E5 2665 's Advantages
Released 5 years and 1 months late
Higher specification of memory (3 vs 2)
Newer PCIe version (3 vs 1)
More modern manufacturing process (32nm vs 90nm)
Opteron 2220 's Advantages
Higher base frequency (2.8GHz vs 2.4GHz)
Lower TDP (95W vs 115W)