Opteron 2222 's Advantages
Higher base frequency (3GHz vs 2.4GHz)
Intel Xeon E5620 's Advantages
Released 2 years and 7 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)